[INFO] cloning repository https://github.com/tokiwadai/rust_prog_lang [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tokiwadai/rust_prog_lang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftokiwadai%2Frust_prog_lang", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftokiwadai%2Frust_prog_lang'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 34d19f5d2570b49f3aac99664021021050edada3 [INFO] testing tokiwadai/rust_prog_lang against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftokiwadai%2Frust_prog_lang" "/workspace/builds/worker-7/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/tokiwadai/rust_prog_lang on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/tokiwadai/rust_prog_lang [INFO] finished tweaking git repo https://github.com/tokiwadai/rust_prog_lang [INFO] tweaked toml for git repo https://github.com/tokiwadai/rust_prog_lang written to /workspace/builds/worker-7/source/Cargo.toml [INFO] crate git repo https://github.com/tokiwadai/rust_prog_lang already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 221d26ebca53a220b9e79de3ead1eb4bcb7e231b9e1ce1069255c84b15c6c843 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "221d26ebca53a220b9e79de3ead1eb4bcb7e231b9e1ce1069255c84b15c6c843", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "221d26ebca53a220b9e79de3ead1eb4bcb7e231b9e1ce1069255c84b15c6c843", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "221d26ebca53a220b9e79de3ead1eb4bcb7e231b9e1ce1069255c84b15c6c843", kill_on_drop: false }` [INFO] [stdout] 221d26ebca53a220b9e79de3ead1eb4bcb7e231b9e1ce1069255c84b15c6c843 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 06d3136a542794f2051ba75482ce744215181fdb215bf0f9625ab02b2ff8621d [INFO] running `Command { std: "docker" "start" "-a" "06d3136a542794f2051ba75482ce744215181fdb215bf0f9625ab02b2ff8621d", kill_on_drop: false }` [INFO] [stderr] Compiling rust_prog_lang v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `order1` [INFO] [stdout] --> src/lib.rs:57:9 [INFO] [stdout] | [INFO] [stdout] 57 | let order1 = back_of_house::Appetizer::Soup; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `order2` [INFO] [stdout] --> src/lib.rs:58:9 [INFO] [stdout] | [INFO] [stdout] 58 | let order2 = back_of_house::Appetizer::Salad; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `seat_at_table` [INFO] [stdout] --> src/front_of_house/hosting.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn seat_at_table() {} [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `take_order` [INFO] [stdout] --> src/front_of_house.rs:4:8 [INFO] [stdout] | [INFO] [stdout] 4 | fn take_order() {} [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `serve_order` [INFO] [stdout] --> src/front_of_house.rs:5:8 [INFO] [stdout] | [INFO] [stdout] 5 | fn serve_order() {} [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `take_payment` [INFO] [stdout] --> src/front_of_house.rs:6:8 [INFO] [stdout] | [INFO] [stdout] 6 | fn take_payment() {} [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `serve_order` [INFO] [stdout] --> src/lib.rs:16:4 [INFO] [stdout] | [INFO] [stdout] 16 | fn serve_order() {} [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `seasonal_fruit` [INFO] [stdout] --> src/lib.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | seasonal_fruit: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `cook_order` [INFO] [stdout] --> src/lib.rs:33:8 [INFO] [stdout] | [INFO] [stdout] 33 | fn cook_order() {} [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `fix_incorrect_order` [INFO] [stdout] --> src/lib.rs:34:8 [INFO] [stdout] | [INFO] [stdout] 34 | fn fix_incorrect_order() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:24 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `u` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:31 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:4 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::time::Duration` [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::time::Duration; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:9:5 [INFO] [stdout] | [INFO] [stdout] 9 | / /** The closure uses v, so it will capture v and make it part of the closure’s environment. [INFO] [stdout] 10 | | Because thread::spawn runs this closure in a new thread, [INFO] [stdout] 11 | | we should be able to access v inside that new thread. */ [INFO] [stdout] 12 | | /** Compile ERROR [INFO] [stdout] ... | [INFO] [stdout] 31 | | we force the closure to take ownership of the values it’s using [INFO] [stdout] 32 | | rather than allowing Rust to infer that it should borrow the values, pp. 397 */ [INFO] [stdout] | |_______________________________________________________________________________________^ [INFO] [stdout] 33 | / let handle: JoinHandle<()> = thread::spawn(move || { [INFO] [stdout] 34 | | println!("Here's a vector: {:?}", v); [INFO] [stdout] 35 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:37:5 [INFO] [stdout] | [INFO] [stdout] 37 | / /** If we added move to the closure, we would move v into the closure’s environment, [INFO] [stdout] 38 | | and we could no longer call drop on it in the main thread, pp. 398 */ [INFO] [stdout] | |_____________________________________________________________________________^ [INFO] [stdout] 39 | // drop(v); // oh no! [INFO] [stdout] 40 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `list` [INFO] [stdout] --> src/bin/chap10/3_generic_trait_samples.rs:21:24 [INFO] [stdout] | [INFO] [stdout] 21 | fn largest_not_work(list: &[T]) -> T { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_list` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:64:5 [INFO] [stdout] | [INFO] [stdout] 64 | / /** This won't compile, pp. 220 [INFO] [stdout] 65 | | let result; [INFO] [stdout] 66 | | { [INFO] [stdout] 67 | | let string2 = String::from("xyz"); [INFO] [stdout] ... | [INFO] [stdout] 70 | | println!("The longest string is {}", result); [INFO] [stdout] 71 | | */ [INFO] [stdout] | |______^ [INFO] [stdout] 72 | [INFO] [stdout] 73 | let string1 = String::from("abcd"); [INFO] [stdout] | ----------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | / /** [INFO] [stdout] 7 | | * you can have only one mutable reference [INFO] [stdout] 8 | | * to a particular piece of data in a particular scope [INFO] [stdout] 9 | | * [INFO] [stdout] 10 | | * Code below will fail [INFO] [stdout] 11 | | */ [INFO] [stdout] | |______^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | / /** The send function takes ownership of its parameter, [INFO] [stdout] 12 | | and when the value is moved, the receiver takes ownership of it. [INFO] [stdout] 13 | | This stops us from accidentally using the value again after sending it; [INFO] [stdout] 14 | | the ownership system checks that everything is okay, pp. 402 */ [INFO] [stdout] | |___________________________________________________________________________^ [INFO] [stdout] 15 | tx.send(val).unwrap(); [INFO] [stdout] | --------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:22:5 [INFO] [stdout] | [INFO] [stdout] 22 | / /** recv , short for receive, which will block the main thread’s execution and [INFO] [stdout] 23 | | wait until a value is sent down the channel. [INFO] [stdout] 24 | | Once a value is sent, recv will return it in a Result. [INFO] [stdout] 25 | | When the sending end of the channel closes, [INFO] [stdout] 26 | | recv will return an error to signal that no more values will be coming, pp. 401 */ [INFO] [stdout] | |__________________________________________________________________________________________^ [INFO] [stdout] 27 | let received = rx.recv().unwrap(); [INFO] [stdout] | ---------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:33:5 [INFO] [stdout] | [INFO] [stdout] 33 | / /** The spawned thread will now send multiple messages [INFO] [stdout] 34 | | and pause for a second between each message, pp. 403 */ [INFO] [stdout] | |_______________________________________________________________^ [INFO] [stdout] 35 | / thread::spawn(move || { [INFO] [stdout] 36 | | let vals = vec![ [INFO] [stdout] 37 | | String::from("hi"), [INFO] [stdout] 38 | | String::from("from"), [INFO] [stdout] ... | [INFO] [stdout] 48 | | } [INFO] [stdout] 49 | | }); [INFO] [stdout] | |______- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:42:9 [INFO] [stdout] | [INFO] [stdout] 42 | / /** We iterate over them, sending each individually, [INFO] [stdout] 43 | | and pause between each by calling the thread::sleep function [INFO] [stdout] 44 | | with a Duration value of 1 second */ [INFO] [stdout] | |________________________________________________^ [INFO] [stdout] 45 | / for val in vals { [INFO] [stdout] 46 | | tx.send(val).unwrap(); [INFO] [stdout] 47 | | thread::sleep(Duration::from_secs(1)); [INFO] [stdout] 48 | | } [INFO] [stdout] | |_________- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:51:5 [INFO] [stdout] | [INFO] [stdout] 51 | / /** Treating rx as an iterator [INFO] [stdout] 52 | | For each value received, we’re printing it. [INFO] [stdout] 53 | | When the channel is closed, iteration will end. */ [INFO] [stdout] | |__________________________________________________________^ [INFO] [stdout] 54 | / for received in rx { [INFO] [stdout] 55 | | println!("Got: {}", received); [INFO] [stdout] 56 | | } [INFO] [stdout] | |_____- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:61:5 [INFO] [stdout] | [INFO] [stdout] 61 | / /** Use mpsc to create multiple threads that all send values to the same receiver. [INFO] [stdout] 62 | | We can do so by cloning the transmitting half of the channel */ [INFO] [stdout] | |_______________________________________________________________________^ [INFO] [stdout] 63 | let tx1 = mpsc::Sender::clone(&tx); [INFO] [stdout] | ----------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:19:13 [INFO] [stdout] | [INFO] [stdout] 19 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:27:30 [INFO] [stdout] | [INFO] [stdout] 27 | fn longest_x<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `string1` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let string1 = String::from("long string is long"); [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_not_work` [INFO] [stdout] --> src/bin/chap10/3_generic_trait_samples.rs:21:4 [INFO] [stdout] | [INFO] [stdout] 21 | fn largest_not_work(list: &[T]) -> T { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:28:9 [INFO] [stdout] | [INFO] [stdout] 28 | let mut s = String::from("hello"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:3:13 [INFO] [stdout] | [INFO] [stdout] 3 | let mut s = String::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | let s = data.to_string(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let s = "initial contents".to_string(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | let s = String::from("initial contents"); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("السلام علیكم"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Dobrý den"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | let hello = String::from("Hello"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | let hello = String::from("Здравствуйте"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:22:9 [INFO] [stdout] | [INFO] [stdout] 22 | let hello = String::from("Hola"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `longest_x` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:27:4 [INFO] [stdout] | [INFO] [stdout] 27 | fn longest_x<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:3:9 [INFO] [stdout] | [INFO] [stdout] 3 | let mut s = String::new(); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/bin/chap4/7_string_slices.rs:3:9 [INFO] [stdout] | [INFO] [stdout] 3 | let word = first_word(&s); // word will get the value 5 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/chap10/1_generic_samples.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | y: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `distance_from_origin` [INFO] [stdout] --> src/bin/chap10/1_generic_samples.rs:12:8 [INFO] [stdout] | [INFO] [stdout] 12 | fn distance_from_origin(&self) -> f32 { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `shoes_in_my_size` [INFO] [stdout] --> src/bin/chap13/5_closure_iter_samples.rs:9:4 [INFO] [stdout] | [INFO] [stdout] 9 | fn shoes_in_my_size(shoes: Vec, shoe_size: u32) -> Vec { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap8/2_vec_immut_ref.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | let mut v = vec![1, 2, 3, 4, 5]; [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/chap9/2_result_recoverable_samples.rs:5:9 [INFO] [stdout] | [INFO] [stdout] 5 | let f = match f { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:40:5 [INFO] [stdout] | [INFO] [stdout] 40 | / /** The lack of infinite output indicates that this code didn’t create a reference cycle. [INFO] [stdout] 41 | | We can also tell this by looking at the values we get from calling Rc::strong_count and Rc::weak_count */ [INFO] [stdout] | |_________________________________________________________________________________________________________________^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:16:5 [INFO] [stdout] | [INFO] [stdout] 16 | /** leaf starts out without a parent, so we create a new, empty Weak reference instance, pp. 386 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 17 | / let leaf = Rc::new(Node { [INFO] [stdout] 18 | | value: 3, [INFO] [stdout] 19 | | parent: RefCell::new(Weak::new()), [INFO] [stdout] 20 | | children: RefCell::new(vec![]), [INFO] [stdout] 21 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:46:5 [INFO] [stdout] | [INFO] [stdout] 46 | /** in an inner scope and examining strong and weak reference counts, pp. 388 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 47 | / let leaf = Rc::new(Node { [INFO] [stdout] 48 | | value: 3, [INFO] [stdout] 49 | | parent: RefCell::new(Weak::new()), [INFO] [stdout] 50 | | children: RefCell::new(vec![]), [INFO] [stdout] 51 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | let c = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `d` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let d = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_d` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:22:9 [INFO] [stdout] | [INFO] [stdout] 22 | let c = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:60:5 [INFO] [stdout] | [INFO] [stdout] 60 | / /** Compile error. [INFO] [stdout] 61 | | The error shows this type “has infnite size.” [INFO] [stdout] 62 | | The reason is that we’ve defined List with a variant that is recursive: [INFO] [stdout] 63 | | it holds another value of itself directly. [INFO] [stdout] 64 | | As a result, Rust can’t figure out how much space it needs to store a List value. */ [INFO] [stdout] | |____________________________________________________________________________________________^ [INFO] [stdout] ... [INFO] [stdout] 68 | / let list: ListBox = Cons(1, [INFO] [stdout] 69 | | Box::new(Cons(2, [INFO] [stdout] 70 | | Box::new(Cons(3, [INFO] [stdout] 71 | | Box::new(Nil)))))); [INFO] [stdout] | |___________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:75:5 [INFO] [stdout] | [INFO] [stdout] 75 | / /** Following the Pointer to the Value with the Dereference Operator, pp. 354 [INFO] [stdout] 76 | | The variable x holds an i32 value, 5. [INFO] [stdout] 77 | | We set y equal to a reference to x. We can assert that x is equal to 5. [INFO] [stdout] 78 | | However, if we want to make an assertion about the value in y, [INFO] [stdout] 79 | | we have to use *y to follow the reference to the value it’s pointing to (hence dereference). [INFO] [stdout] 80 | | Once we dereference y, we have access to the integer value y is pointing to [INFO] [stdout] 81 | | that we can compare with 5, pp. 355 */ [INFO] [stdout] | |______________________________________________^ [INFO] [stdout] 82 | let x = 5; [INFO] [stdout] | ---------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:104:5 [INFO] [stdout] | [INFO] [stdout] 104 | / /** [INFO] [stdout] 105 | | * Implicit Deref Coercions with Functions and Methods, pp. 359 */ [INFO] [stdout] | |______________________________________________________________________^ [INFO] [stdout] 106 | // call the hello function with a string slice as an argument, pp. 359 [INFO] [stdout] 107 | hello("Rust1"); [INFO] [stdout] | -------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:115:5 [INFO] [stdout] | [INFO] [stdout] 115 | / /** If Rust didn’t implement deref coercion, [INFO] [stdout] 116 | | we would have to write the code like below instead, [INFO] [stdout] 117 | | to call hello with a value of type &MyBox, pp. 359 [INFO] [stdout] 118 | | */ [INFO] [stdout] | |______^ [INFO] [stdout] 119 | let m = MyBox::new(String::from("Rust3")); [INFO] [stdout] | ------------------------------------------ rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:120:5 [INFO] [stdout] | [INFO] [stdout] 120 | / /** The (*m) dereferences the MyBox into a String . [INFO] [stdout] 121 | | Then the & and take a string slice of the String [INFO] [stdout] 122 | | that is equal to the whole string to match the signature of hello, pp. 360 */ [INFO] [stdout] | |_____________________________________________________________________________________^ [INFO] [stdout] 123 | hello(&(*m)[..]); [INFO] [stdout] | ---------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `value` [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 10 | value: i32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `children` [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 12 | children: RefCell>>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:31:5 [INFO] [stdout] | [INFO] [stdout] 31 | /** We create an Rc instance holding a List value in the variable a with an initial list of 5, Nil. */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 32 | let a: Rc = Rc::new(Cons(5,RefCell::new(Rc::new(Nil)))); [INFO] [stdout] | -------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:36:5 [INFO] [stdout] | [INFO] [stdout] 36 | / /** We then create an Rc instance holding another List value in the variable b [INFO] [stdout] 37 | | that contains the value 10 and points to the list in a, pp. 381 */ [INFO] [stdout] | |__________________________________________________________________________^ [INFO] [stdout] 38 | let b: Rc = Rc::new(Cons(10,RefCell::new(Rc::clone(&a)))); [INFO] [stdout] | ---------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:43:5 [INFO] [stdout] | [INFO] [stdout] 43 | / /** We modify a so it points to b instead of Nil, creating a cycle. [INFO] [stdout] 44 | | We do that by using the tail method to get a reference to the RefCell>. [INFO] [stdout] 45 | | Then we use the borrow_mut method on the RefCell> to change the value inside from an Rc [INFO] [stdout] 46 | | that holds a Nil value to the Rc in b, pp. 381 */ [INFO] [stdout] | |_______________________________________________________________^ [INFO] [stdout] 47 | / if let Some(link) = a.tail() { [INFO] [stdout] 48 | | *link.borrow_mut() = Rc::clone(&b); [INFO] [stdout] 49 | | } [INFO] [stdout] | |_____- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `s2` is never read [INFO] [stdout] --> src/bin/chap4/1_variable_scope.rs:7:13 [INFO] [stdout] | [INFO] [stdout] 7 | let mut s2 = "hello world!"; [INFO] [stdout] | ^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: type `List_Box` should have an upper camel case name [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:2:6 [INFO] [stdout] | [INFO] [stdout] 2 | enum List_Box { [INFO] [stdout] | ^^^^^^^^ help: convert the identifier to upper camel case: `ListBox` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_camel_case_types)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:21:5 [INFO] [stdout] | [INFO] [stdout] 21 | / /** The Cons variants own the data they hold, so when we create the b list, [INFO] [stdout] 22 | | a is moved into b and b owns a. Then, when we try to use a again when creating c, [INFO] [stdout] 23 | | we’re not allowed to because a has been moved, pp. 366 [INFO] [stdout] 24 | | */ [INFO] [stdout] | |______^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:16:5 [INFO] [stdout] | [INFO] [stdout] 16 | /** Box allows immutable or mutable borrows checked at compile time, pp. 370 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 17 | / let a = List_Box::Cons(5, [INFO] [stdout] 18 | | Box::new(List_Box::Cons(10, [INFO] [stdout] 19 | | Box::new(List_Box::Nil)))); [INFO] [stdout] | |______________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:29:5 [INFO] [stdout] | [INFO] [stdout] 29 | / /** pp 370 [INFO] [stdout] 30 | | - Rc ENABLES MULTIPLE OWNERS of the same data, [INFO] [stdout] 31 | | while Box and RefCell have single owners [INFO] [stdout] 32 | | - Rc allows only IMMUTABLE borrows checked at compile time [INFO] [stdout] 33 | | */ [INFO] [stdout] | |__________^ [INFO] [stdout] 34 | / let a: Rc = Rc::new(List::Cons(5, [INFO] [stdout] 35 | | Rc::new(List::Cons(10, [INFO] [stdout] 36 | | Rc::new(List::Nil))))); [INFO] [stdout] | |_________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:37:5 [INFO] [stdout] | [INFO] [stdout] 37 | / /** The implementation of Rc::clone doesn’t make a deep copy of all the data [INFO] [stdout] 38 | | like most types’ implementations of clone do. [INFO] [stdout] 39 | | The call to Rc::clone only increments the reference count, which doesn’t take much time. [INFO] [stdout] 40 | | Deep copies of data can take a lot of time, pp. 367 */ [INFO] [stdout] | |______________________________________________________________^ [INFO] [stdout] 41 | let b = List::Cons(3, Rc::clone(&a)); [INFO] [stdout] | ------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:48:5 [INFO] [stdout] | [INFO] [stdout] 48 | /** Printing the reference count, pp. 368 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 49 | / let a = Rc::new(List::Cons(5, [INFO] [stdout] 50 | | Rc::new(List::Cons(10, [INFO] [stdout] 51 | | Rc::new(List::Nil))))); [INFO] [stdout] | |_________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b` [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:53:9 [INFO] [stdout] | [INFO] [stdout] 53 | let b = List::Cons(3, Rc::clone(&a)); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:56:13 [INFO] [stdout] | [INFO] [stdout] 56 | let c = List::Cons(4, Rc::clone(&a)); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::rc::Rc` [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use std::rc::Rc; [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:20:5 [INFO] [stdout] | [INFO] [stdout] 20 | / /** Mutex is smart pointer. [INFO] [stdout] 21 | | The call to lock returns a MutexGuard wrapped in a LockResult [INFO] [stdout] 22 | | that we handled with the call to unwrap. [INFO] [stdout] 23 | | [INFO] [stdout] ... | [INFO] [stdout] 29 | | blocking the mutex from being used by other threads [INFO] [stdout] 30 | | because the lock release happens automatically, pp. 408 */ [INFO] [stdout] | |__________________________________________________________________^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:34:5 [INFO] [stdout] | [INFO] [stdout] 34 | / /** Sharing a Mutex Between Multiple Threads, pp. 408 */ [INFO] [stdout] 35 | | /** Compile Error [INFO] [stdout] 36 | | The error message states that the counter value was moved [INFO] [stdout] 37 | | in the previous iteration of the loop. [INFO] [stdout] ... | [INFO] [stdout] 56 | /| /** [INFO] [stdout] 57 | || let counter = Rc::clone(&counter); [INFO] [stdout] 58 | || [INFO] [stdout] 59 | || let mut handles = vec![]; [INFO] [stdout] ... || [INFO] [stdout] 71 | || println!("Result: {}", *counter.lock().unwrap()); [INFO] [stdout] 72 | || */ [INFO] [stdout] | ||______^ [INFO] [stdout] | |_______| [INFO] [stdout] | rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:10:9 [INFO] [stdout] | [INFO] [stdout] 10 | / /** To access the data inside the mutex, we use the method to acquire the lock. [INFO] [stdout] 11 | | This call will block the current thread so it can’t do any work [INFO] [stdout] 12 | | until it’s our turn to have the lock. [INFO] [stdout] 13 | | [INFO] [stdout] 14 | | The call to lock would fail if another thread holding the lock panicked. [INFO] [stdout] 15 | | In that case, no one would ever be able to get the lock, [INFO] [stdout] 16 | | so we’ve chosen to unwrap and have this thread panic in that situation, pp. 407 */ [INFO] [stdout] | |______________________________________________________________________________________________^ [INFO] [stdout] 17 | let mut num: MutexGuard = m.lock().unwrap(); [INFO] [stdout] | ------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:12:4 [INFO] [stdout] | [INFO] [stdout] 12 | fn read_username_from_file() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file2` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:29:4 [INFO] [stdout] | [INFO] [stdout] 29 | fn read_username_from_file2() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file3` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:38:4 [INFO] [stdout] | [INFO] [stdout] 38 | fn read_username_from_file3() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_string` [INFO] [stdout] --> src/bin/chap4/4_reference_borrowing.rs:28:17 [INFO] [stdout] | [INFO] [stdout] 28 | fn change_immut(some_string: &String) { [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/chap9/3_result_matching_samples.rs:43:9 [INFO] [stdout] | [INFO] [stdout] 43 | let f = File::open("hello2.txt") [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr1` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | addr1: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr2` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 5 | addr2: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr3` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | addr3: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr4` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:7:5 [INFO] [stdout] | [INFO] [stdout] 7 | addr4: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `address` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:13:5 [INFO] [stdout] | [INFO] [stdout] 13 | address: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `name` [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:9:18 [INFO] [stdout] | [INFO] [stdout] 9 | pub fn greeting2(name: &str) -> String { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_name` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `value` [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:14:5 [INFO] [stdout] | [INFO] [stdout] 14 | value: i32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `newB` should have a snake case name [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:24:12 [INFO] [stdout] | [INFO] [stdout] 24 | pub fn newB(value: i32) -> Guess { [INFO] [stdout] | ^^^^ help: convert the identifier to snake case: `new_b` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `kind` [INFO] [stdout] --> src/bin/chap6/1_enum_sample.rs:9:5 [INFO] [stdout] | [INFO] [stdout] 9 | kind: IpAddrKind, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `address` [INFO] [stdout] --> src/bin/chap6/1_enum_sample.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 10 | address: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/bin/chap10/4_generic_trait_samples.rs:10:8 [INFO] [stdout] | [INFO] [stdout] 10 | fn new(x: T, y: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/2_thread_samples.rs:18:5 [INFO] [stdout] | [INFO] [stdout] 18 | / /** Calling join on the handle blocks the thread currently running [INFO] [stdout] 19 | | until the thread represented by the handle terminates. [INFO] [stdout] 20 | | Blocking a thread means that thread is prevented from performing work or exiting. [INFO] [stdout] 21 | | [INFO] [stdout] 22 | | The two threads continue alternating, [INFO] [stdout] 23 | | but the main thread waits because of the call to handle.join() and [INFO] [stdout] 24 | | does not end until the spawned thread is nished., pp. 393 */ [INFO] [stdout] | |____________________________________________________________________^ [INFO] [stdout] 25 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/bin/chap13/6_create_own_iter_samples.rs:6:8 [INFO] [stdout] | [INFO] [stdout] 6 | fn new() -> Counter { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/3_thread_samples.rs:13:5 [INFO] [stdout] | [INFO] [stdout] 13 | / /** The main thread will wait for the spawned thread to finish and [INFO] [stdout] 14 | | then run its for loop, so the output won’t be interleaved anymore, pp. 394 */ [INFO] [stdout] | |_____________________________________________________________________________________^ [INFO] [stdout] 15 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 24.34s [INFO] running `Command { std: "docker" "inspect" "06d3136a542794f2051ba75482ce744215181fdb215bf0f9625ab02b2ff8621d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "06d3136a542794f2051ba75482ce744215181fdb215bf0f9625ab02b2ff8621d", kill_on_drop: false }` [INFO] [stdout] 06d3136a542794f2051ba75482ce744215181fdb215bf0f9625ab02b2ff8621d [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 3e95ce09642353999e8bf9423c9f05b47c0b5e46a0180b7d4253df7bc87262fa [INFO] running `Command { std: "docker" "start" "-a" "3e95ce09642353999e8bf9423c9f05b47c0b5e46a0180b7d4253df7bc87262fa", kill_on_drop: false }` [INFO] [stdout] warning: unused variable: `order1` [INFO] [stdout] --> src/lib.rs:57:9 [INFO] [stdout] | [INFO] [stdout] 57 | let order1 = back_of_house::Appetizer::Soup; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `order2` [INFO] [stdout] --> src/lib.rs:58:9 [INFO] [stdout] | [INFO] [stdout] 58 | let order2 = back_of_house::Appetizer::Salad; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `seat_at_table` [INFO] [stdout] --> src/front_of_house/hosting.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn seat_at_table() {} [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `take_order` [INFO] [stdout] --> src/front_of_house.rs:4:8 [INFO] [stdout] | [INFO] [stdout] 4 | fn take_order() {} [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling rust_prog_lang v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: function is never used: `serve_order` [INFO] [stdout] --> src/front_of_house.rs:5:8 [INFO] [stdout] | [INFO] [stdout] 5 | fn serve_order() {} [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `take_payment` [INFO] [stdout] --> src/front_of_house.rs:6:8 [INFO] [stdout] | [INFO] [stdout] 6 | fn take_payment() {} [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `serve_order` [INFO] [stdout] --> src/lib.rs:16:4 [INFO] [stdout] | [INFO] [stdout] 16 | fn serve_order() {} [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `seasonal_fruit` [INFO] [stdout] --> src/lib.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | seasonal_fruit: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `cook_order` [INFO] [stdout] --> src/lib.rs:33:8 [INFO] [stdout] | [INFO] [stdout] 33 | fn cook_order() {} [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `fix_incorrect_order` [INFO] [stdout] --> src/lib.rs:34:8 [INFO] [stdout] | [INFO] [stdout] 34 | fn fix_incorrect_order() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/bin/chap4/7_string_slices.rs:3:9 [INFO] [stdout] | [INFO] [stdout] 3 | let word = first_word(&s); // word will get the value 5 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:40:5 [INFO] [stdout] | [INFO] [stdout] 40 | / /** The lack of infinite output indicates that this code didn’t create a reference cycle. [INFO] [stdout] 41 | | We can also tell this by looking at the values we get from calling Rc::strong_count and Rc::weak_count */ [INFO] [stdout] | |_________________________________________________________________________________________________________________^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:16:5 [INFO] [stdout] | [INFO] [stdout] 16 | /** leaf starts out without a parent, so we create a new, empty Weak reference instance, pp. 386 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 17 | / let leaf = Rc::new(Node { [INFO] [stdout] 18 | | value: 3, [INFO] [stdout] 19 | | parent: RefCell::new(Weak::new()), [INFO] [stdout] 20 | | children: RefCell::new(vec![]), [INFO] [stdout] 21 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:46:5 [INFO] [stdout] | [INFO] [stdout] 46 | /** in an inner scope and examining strong and weak reference counts, pp. 388 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 47 | / let leaf = Rc::new(Node { [INFO] [stdout] 48 | | value: 3, [INFO] [stdout] 49 | | parent: RefCell::new(Weak::new()), [INFO] [stdout] 50 | | children: RefCell::new(vec![]), [INFO] [stdout] 51 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `value` [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 10 | value: i32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `children` [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 12 | children: RefCell>>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_string` [INFO] [stdout] --> src/bin/chap4/4_reference_borrowing.rs:28:17 [INFO] [stdout] | [INFO] [stdout] 28 | fn change_immut(some_string: &String) { [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr1` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | addr1: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr2` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 5 | addr2: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr3` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | addr3: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr4` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:7:5 [INFO] [stdout] | [INFO] [stdout] 7 | addr4: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `address` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:13:5 [INFO] [stdout] | [INFO] [stdout] 13 | address: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `name` [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:9:18 [INFO] [stdout] | [INFO] [stdout] 9 | pub fn greeting2(name: &str) -> String { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_name` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `value` [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:14:5 [INFO] [stdout] | [INFO] [stdout] 14 | value: i32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `newB` should have a snake case name [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:24:12 [INFO] [stdout] | [INFO] [stdout] 24 | pub fn newB(value: i32) -> Guess { [INFO] [stdout] | ^^^^ help: convert the identifier to snake case: `new_b` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/chap9/3_result_matching_samples.rs:43:9 [INFO] [stdout] | [INFO] [stdout] 43 | let f = File::open("hello2.txt") [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `list` [INFO] [stdout] --> src/bin/chap10/3_generic_trait_samples.rs:21:24 [INFO] [stdout] | [INFO] [stdout] 21 | fn largest_not_work(list: &[T]) -> T { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_list` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_not_work` [INFO] [stdout] --> src/bin/chap10/3_generic_trait_samples.rs:21:4 [INFO] [stdout] | [INFO] [stdout] 21 | fn largest_not_work(list: &[T]) -> T { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:3:13 [INFO] [stdout] | [INFO] [stdout] 3 | let mut s = String::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | let s = data.to_string(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let s = "initial contents".to_string(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | let s = String::from("initial contents"); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("السلام علیكم"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Dobrý den"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | let hello = String::from("Hello"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | let hello = String::from("Здравствуйте"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:22:9 [INFO] [stdout] | [INFO] [stdout] 22 | let hello = String::from("Hola"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:3:9 [INFO] [stdout] | [INFO] [stdout] 3 | let mut s = String::new(); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:40:5 [INFO] [stdout] | [INFO] [stdout] 40 | / /** The lack of infinite output indicates that this code didn’t create a reference cycle. [INFO] [stdout] 41 | | We can also tell this by looking at the values we get from calling Rc::strong_count and Rc::weak_count */ [INFO] [stdout] | |_________________________________________________________________________________________________________________^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:16:5 [INFO] [stdout] | [INFO] [stdout] 16 | /** leaf starts out without a parent, so we create a new, empty Weak reference instance, pp. 386 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 17 | / let leaf = Rc::new(Node { [INFO] [stdout] 18 | | value: 3, [INFO] [stdout] 19 | | parent: RefCell::new(Weak::new()), [INFO] [stdout] 20 | | children: RefCell::new(vec![]), [INFO] [stdout] 21 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:46:5 [INFO] [stdout] | [INFO] [stdout] 46 | /** in an inner scope and examining strong and weak reference counts, pp. 388 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 47 | / let leaf = Rc::new(Node { [INFO] [stdout] 48 | | value: 3, [INFO] [stdout] 49 | | parent: RefCell::new(Weak::new()), [INFO] [stdout] 50 | | children: RefCell::new(vec![]), [INFO] [stdout] 51 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::time::Duration` [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::time::Duration; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:9:5 [INFO] [stdout] | [INFO] [stdout] 9 | / /** The closure uses v, so it will capture v and make it part of the closure’s environment. [INFO] [stdout] 10 | | Because thread::spawn runs this closure in a new thread, [INFO] [stdout] 11 | | we should be able to access v inside that new thread. */ [INFO] [stdout] 12 | | /** Compile ERROR [INFO] [stdout] ... | [INFO] [stdout] 31 | | we force the closure to take ownership of the values it’s using [INFO] [stdout] 32 | | rather than allowing Rust to infer that it should borrow the values, pp. 397 */ [INFO] [stdout] | |_______________________________________________________________________________________^ [INFO] [stdout] 33 | / let handle: JoinHandle<()> = thread::spawn(move || { [INFO] [stdout] 34 | | println!("Here's a vector: {:?}", v); [INFO] [stdout] 35 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:37:5 [INFO] [stdout] | [INFO] [stdout] 37 | / /** If we added move to the closure, we would move v into the closure’s environment, [INFO] [stdout] 38 | | and we could no longer call drop on it in the main thread, pp. 398 */ [INFO] [stdout] | |_____________________________________________________________________________^ [INFO] [stdout] 39 | // drop(v); // oh no! [INFO] [stdout] 40 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:64:5 [INFO] [stdout] | [INFO] [stdout] 64 | / /** This won't compile, pp. 220 [INFO] [stdout] 65 | | let result; [INFO] [stdout] 66 | | { [INFO] [stdout] 67 | | let string2 = String::from("xyz"); [INFO] [stdout] ... | [INFO] [stdout] 70 | | println!("The longest string is {}", result); [INFO] [stdout] 71 | | */ [INFO] [stdout] | |______^ [INFO] [stdout] 72 | [INFO] [stdout] 73 | let string1 = String::from("abcd"); [INFO] [stdout] | ----------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:27:30 [INFO] [stdout] | [INFO] [stdout] 27 | fn longest_x<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `string1` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let string1 = String::from("long string is long"); [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/2_thread_samples.rs:18:5 [INFO] [stdout] | [INFO] [stdout] 18 | / /** Calling join on the handle blocks the thread currently running [INFO] [stdout] 19 | | until the thread represented by the handle terminates. [INFO] [stdout] 20 | | Blocking a thread means that thread is prevented from performing work or exiting. [INFO] [stdout] 21 | | [INFO] [stdout] 22 | | The two threads continue alternating, [INFO] [stdout] 23 | | but the main thread waits because of the call to handle.join() and [INFO] [stdout] 24 | | does not end until the spawned thread is nished., pp. 393 */ [INFO] [stdout] | |____________________________________________________________________^ [INFO] [stdout] 25 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `order1` [INFO] [stdout] --> src/lib.rs:57:9 [INFO] [stdout] | [INFO] [stdout] 57 | let order1 = back_of_house::Appetizer::Soup; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `order2` [INFO] [stdout] --> src/lib.rs:58:9 [INFO] [stdout] | [INFO] [stdout] 58 | let order2 = back_of_house::Appetizer::Salad; [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap8/2_vec_immut_ref.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | let mut v = vec![1, 2, 3, 4, 5]; [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `longest_x` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:27:4 [INFO] [stdout] | [INFO] [stdout] 27 | fn longest_x<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `value` [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 10 | value: i32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `children` [INFO] [stdout] --> src/bin/chap15/7_rc_weak_samples.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 12 | children: RefCell>>, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `name` [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:9:18 [INFO] [stdout] | [INFO] [stdout] 9 | pub fn greeting2(name: &str) -> String { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_name` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `seat_at_table` [INFO] [stdout] --> src/front_of_house/hosting.rs:2:4 [INFO] [stdout] | [INFO] [stdout] 2 | fn seat_at_table() {} [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `take_order` [INFO] [stdout] --> src/front_of_house.rs:4:8 [INFO] [stdout] | [INFO] [stdout] 4 | fn take_order() {} [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `serve_order` [INFO] [stdout] --> src/front_of_house.rs:5:8 [INFO] [stdout] | [INFO] [stdout] 5 | fn serve_order() {} [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `take_payment` [INFO] [stdout] --> src/front_of_house.rs:6:8 [INFO] [stdout] | [INFO] [stdout] 6 | fn take_payment() {} [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `serve_order` [INFO] [stdout] --> src/lib.rs:16:4 [INFO] [stdout] | [INFO] [stdout] 16 | fn serve_order() {} [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `seasonal_fruit` [INFO] [stdout] --> src/lib.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | seasonal_fruit: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `cook_order` [INFO] [stdout] --> src/lib.rs:33:8 [INFO] [stdout] | [INFO] [stdout] 33 | fn cook_order() {} [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `fix_incorrect_order` [INFO] [stdout] --> src/lib.rs:34:8 [INFO] [stdout] | [INFO] [stdout] 34 | fn fix_incorrect_order() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `s2` is never read [INFO] [stdout] --> src/bin/chap4/1_variable_scope.rs:7:13 [INFO] [stdout] | [INFO] [stdout] 7 | let mut s2 = "hello world!"; [INFO] [stdout] | ^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `value` [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:14:5 [INFO] [stdout] | [INFO] [stdout] 14 | value: i32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `newB` should have a snake case name [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:24:12 [INFO] [stdout] | [INFO] [stdout] 24 | pub fn newB(value: i32) -> Guess { [INFO] [stdout] | ^^^^ help: convert the identifier to snake case: `new_b` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `greater_than_100B` should have a snake case name [INFO] [stdout] --> src/bin/chap11/1_test_samples.rs:81:8 [INFO] [stdout] | [INFO] [stdout] 81 | fn greater_than_100B() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `greater_than_100_b` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `list` [INFO] [stdout] --> src/bin/chap10/3_generic_trait_samples.rs:21:24 [INFO] [stdout] | [INFO] [stdout] 21 | fn largest_not_work(list: &[T]) -> T { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_list` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_not_work` [INFO] [stdout] --> src/bin/chap10/3_generic_trait_samples.rs:21:4 [INFO] [stdout] | [INFO] [stdout] 21 | fn largest_not_work(list: &[T]) -> T { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:24 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `u` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:31 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:4 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: type `List_Box` should have an upper camel case name [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:2:6 [INFO] [stdout] | [INFO] [stdout] 2 | enum List_Box { [INFO] [stdout] | ^^^^^^^^ help: convert the identifier to upper camel case: `ListBox` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_camel_case_types)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:21:5 [INFO] [stdout] | [INFO] [stdout] 21 | / /** The Cons variants own the data they hold, so when we create the b list, [INFO] [stdout] 22 | | a is moved into b and b owns a. Then, when we try to use a again when creating c, [INFO] [stdout] 23 | | we’re not allowed to because a has been moved, pp. 366 [INFO] [stdout] 24 | | */ [INFO] [stdout] | |______^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:16:5 [INFO] [stdout] | [INFO] [stdout] 16 | /** Box allows immutable or mutable borrows checked at compile time, pp. 370 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 17 | / let a = List_Box::Cons(5, [INFO] [stdout] 18 | | Box::new(List_Box::Cons(10, [INFO] [stdout] 19 | | Box::new(List_Box::Nil)))); [INFO] [stdout] | |______________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:29:5 [INFO] [stdout] | [INFO] [stdout] 29 | / /** pp 370 [INFO] [stdout] 30 | | - Rc ENABLES MULTIPLE OWNERS of the same data, [INFO] [stdout] 31 | | while Box and RefCell have single owners [INFO] [stdout] 32 | | - Rc allows only IMMUTABLE borrows checked at compile time [INFO] [stdout] 33 | | */ [INFO] [stdout] | |__________^ [INFO] [stdout] 34 | / let a: Rc = Rc::new(List::Cons(5, [INFO] [stdout] 35 | | Rc::new(List::Cons(10, [INFO] [stdout] 36 | | Rc::new(List::Nil))))); [INFO] [stdout] | |_________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:37:5 [INFO] [stdout] | [INFO] [stdout] 37 | / /** The implementation of Rc::clone doesn’t make a deep copy of all the data [INFO] [stdout] 38 | | like most types’ implementations of clone do. [INFO] [stdout] 39 | | The call to Rc::clone only increments the reference count, which doesn’t take much time. [INFO] [stdout] 40 | | Deep copies of data can take a lot of time, pp. 367 */ [INFO] [stdout] | |______________________________________________________________^ [INFO] [stdout] 41 | let b = List::Cons(3, Rc::clone(&a)); [INFO] [stdout] | ------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:48:5 [INFO] [stdout] | [INFO] [stdout] 48 | /** Printing the reference count, pp. 368 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 49 | / let a = Rc::new(List::Cons(5, [INFO] [stdout] 50 | | Rc::new(List::Cons(10, [INFO] [stdout] 51 | | Rc::new(List::Nil))))); [INFO] [stdout] | |_________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b` [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:53:9 [INFO] [stdout] | [INFO] [stdout] 53 | let b = List::Cons(3, Rc::clone(&a)); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:56:13 [INFO] [stdout] | [INFO] [stdout] 56 | let c = List::Cons(4, Rc::clone(&a)); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `s2` is never read [INFO] [stdout] --> src/bin/chap4/1_variable_scope.rs:7:13 [INFO] [stdout] | [INFO] [stdout] 7 | let mut s2 = "hello world!"; [INFO] [stdout] | ^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_assignments)]` on by default [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | / /** [INFO] [stdout] 7 | | * you can have only one mutable reference [INFO] [stdout] 8 | | * to a particular piece of data in a particular scope [INFO] [stdout] 9 | | * [INFO] [stdout] 10 | | * Code below will fail [INFO] [stdout] 11 | | */ [INFO] [stdout] | |______^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:19:13 [INFO] [stdout] | [INFO] [stdout] 19 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:28:9 [INFO] [stdout] | [INFO] [stdout] 28 | let mut s = String::from("hello"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/bin/chap10/4_generic_trait_samples.rs:10:8 [INFO] [stdout] | [INFO] [stdout] 10 | fn new(x: T, y: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:12:4 [INFO] [stdout] | [INFO] [stdout] 12 | fn read_username_from_file() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file2` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:29:4 [INFO] [stdout] | [INFO] [stdout] 29 | fn read_username_from_file2() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file3` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:38:4 [INFO] [stdout] | [INFO] [stdout] 38 | fn read_username_from_file3() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::time::Duration` [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:2:5 [INFO] [stdout] | [INFO] [stdout] 2 | use std::time::Duration; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:9:5 [INFO] [stdout] | [INFO] [stdout] 9 | / /** The closure uses v, so it will capture v and make it part of the closure’s environment. [INFO] [stdout] 10 | | Because thread::spawn runs this closure in a new thread, [INFO] [stdout] 11 | | we should be able to access v inside that new thread. */ [INFO] [stdout] 12 | | /** Compile ERROR [INFO] [stdout] ... | [INFO] [stdout] 31 | | we force the closure to take ownership of the values it’s using [INFO] [stdout] 32 | | rather than allowing Rust to infer that it should borrow the values, pp. 397 */ [INFO] [stdout] | |_______________________________________________________________________________________^ [INFO] [stdout] 33 | / let handle: JoinHandle<()> = thread::spawn(move || { [INFO] [stdout] 34 | | println!("Here's a vector: {:?}", v); [INFO] [stdout] 35 | | }); [INFO] [stdout] | |_______- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/4_closure_thread_samples.rs:37:5 [INFO] [stdout] | [INFO] [stdout] 37 | / /** If we added move to the closure, we would move v into the closure’s environment, [INFO] [stdout] 38 | | and we could no longer call drop on it in the main thread, pp. 398 */ [INFO] [stdout] | |_____________________________________________________________________________^ [INFO] [stdout] 39 | // drop(v); // oh no! [INFO] [stdout] 40 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/chap10/1_generic_samples.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | y: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `distance_from_origin` [INFO] [stdout] --> src/bin/chap10/1_generic_samples.rs:12:8 [INFO] [stdout] | [INFO] [stdout] 12 | fn distance_from_origin(&self) -> f32 { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:60:5 [INFO] [stdout] | [INFO] [stdout] 60 | / /** Compile error. [INFO] [stdout] 61 | | The error shows this type “has infnite size.” [INFO] [stdout] 62 | | The reason is that we’ve defined List with a variant that is recursive: [INFO] [stdout] 63 | | it holds another value of itself directly. [INFO] [stdout] 64 | | As a result, Rust can’t figure out how much space it needs to store a List value. */ [INFO] [stdout] | |____________________________________________________________________________________________^ [INFO] [stdout] ... [INFO] [stdout] 68 | / let list: ListBox = Cons(1, [INFO] [stdout] 69 | | Box::new(Cons(2, [INFO] [stdout] 70 | | Box::new(Cons(3, [INFO] [stdout] 71 | | Box::new(Nil)))))); [INFO] [stdout] | |___________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:75:5 [INFO] [stdout] | [INFO] [stdout] 75 | / /** Following the Pointer to the Value with the Dereference Operator, pp. 354 [INFO] [stdout] 76 | | The variable x holds an i32 value, 5. [INFO] [stdout] 77 | | We set y equal to a reference to x. We can assert that x is equal to 5. [INFO] [stdout] 78 | | However, if we want to make an assertion about the value in y, [INFO] [stdout] 79 | | we have to use *y to follow the reference to the value it’s pointing to (hence dereference). [INFO] [stdout] 80 | | Once we dereference y, we have access to the integer value y is pointing to [INFO] [stdout] 81 | | that we can compare with 5, pp. 355 */ [INFO] [stdout] | |______________________________________________^ [INFO] [stdout] 82 | let x = 5; [INFO] [stdout] | ---------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:104:5 [INFO] [stdout] | [INFO] [stdout] 104 | / /** [INFO] [stdout] 105 | | * Implicit Deref Coercions with Functions and Methods, pp. 359 */ [INFO] [stdout] | |______________________________________________________________________^ [INFO] [stdout] 106 | // call the hello function with a string slice as an argument, pp. 359 [INFO] [stdout] 107 | hello("Rust1"); [INFO] [stdout] | -------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:115:5 [INFO] [stdout] | [INFO] [stdout] 115 | / /** If Rust didn’t implement deref coercion, [INFO] [stdout] 116 | | we would have to write the code like below instead, [INFO] [stdout] 117 | | to call hello with a value of type &MyBox, pp. 359 [INFO] [stdout] 118 | | */ [INFO] [stdout] | |______^ [INFO] [stdout] 119 | let m = MyBox::new(String::from("Rust3")); [INFO] [stdout] | ------------------------------------------ rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:120:5 [INFO] [stdout] | [INFO] [stdout] 120 | / /** The (*m) dereferences the MyBox into a String . [INFO] [stdout] 121 | | Then the & and take a string slice of the String [INFO] [stdout] 122 | | that is equal to the whole string to match the signature of hello, pp. 360 */ [INFO] [stdout] | |_____________________________________________________________________________________^ [INFO] [stdout] 123 | hello(&(*m)[..]); [INFO] [stdout] | ---------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `kind` [INFO] [stdout] --> src/bin/chap6/1_enum_sample.rs:9:5 [INFO] [stdout] | [INFO] [stdout] 9 | kind: IpAddrKind, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `address` [INFO] [stdout] --> src/bin/chap6/1_enum_sample.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 10 | address: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: type `List_Box` should have an upper camel case name [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:2:6 [INFO] [stdout] | [INFO] [stdout] 2 | enum List_Box { [INFO] [stdout] | ^^^^^^^^ help: convert the identifier to upper camel case: `ListBox` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_camel_case_types)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:21:5 [INFO] [stdout] | [INFO] [stdout] 21 | / /** The Cons variants own the data they hold, so when we create the b list, [INFO] [stdout] 22 | | a is moved into b and b owns a. Then, when we try to use a again when creating c, [INFO] [stdout] 23 | | we’re not allowed to because a has been moved, pp. 366 [INFO] [stdout] 24 | | */ [INFO] [stdout] | |______^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:16:5 [INFO] [stdout] | [INFO] [stdout] 16 | /** Box allows immutable or mutable borrows checked at compile time, pp. 370 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 17 | / let a = List_Box::Cons(5, [INFO] [stdout] 18 | | Box::new(List_Box::Cons(10, [INFO] [stdout] 19 | | Box::new(List_Box::Nil)))); [INFO] [stdout] | |______________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:29:5 [INFO] [stdout] | [INFO] [stdout] 29 | / /** pp 370 [INFO] [stdout] 30 | | - Rc ENABLES MULTIPLE OWNERS of the same data, [INFO] [stdout] 31 | | while Box and RefCell have single owners [INFO] [stdout] 32 | | - Rc allows only IMMUTABLE borrows checked at compile time [INFO] [stdout] 33 | | */ [INFO] [stdout] | |__________^ [INFO] [stdout] 34 | / let a: Rc = Rc::new(List::Cons(5, [INFO] [stdout] 35 | | Rc::new(List::Cons(10, [INFO] [stdout] 36 | | Rc::new(List::Nil))))); [INFO] [stdout] | |_________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:37:5 [INFO] [stdout] | [INFO] [stdout] 37 | / /** The implementation of Rc::clone doesn’t make a deep copy of all the data [INFO] [stdout] 38 | | like most types’ implementations of clone do. [INFO] [stdout] 39 | | The call to Rc::clone only increments the reference count, which doesn’t take much time. [INFO] [stdout] 40 | | Deep copies of data can take a lot of time, pp. 367 */ [INFO] [stdout] | |______________________________________________________________^ [INFO] [stdout] 41 | let b = List::Cons(3, Rc::clone(&a)); [INFO] [stdout] | ------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:48:5 [INFO] [stdout] | [INFO] [stdout] 48 | /** Printing the reference count, pp. 368 */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 49 | / let a = Rc::new(List::Cons(5, [INFO] [stdout] 50 | | Rc::new(List::Cons(10, [INFO] [stdout] 51 | | Rc::new(List::Nil))))); [INFO] [stdout] | |_________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/bin/chap4/7_string_slices.rs:3:9 [INFO] [stdout] | [INFO] [stdout] 3 | let word = first_word(&s); // word will get the value 5 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b` [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:53:9 [INFO] [stdout] | [INFO] [stdout] 53 | let b = List::Cons(3, Rc::clone(&a)); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/3_rc_samples.rs:56:13 [INFO] [stdout] | [INFO] [stdout] 56 | let c = List::Cons(4, Rc::clone(&a)); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | let c = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `d` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let d = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_d` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:22:9 [INFO] [stdout] | [INFO] [stdout] 22 | let c = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/chap10/1_generic_samples.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | y: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `distance_from_origin` [INFO] [stdout] --> src/bin/chap10/1_generic_samples.rs:12:8 [INFO] [stdout] | [INFO] [stdout] 12 | fn distance_from_origin(&self) -> f32 { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/3_thread_samples.rs:13:5 [INFO] [stdout] | [INFO] [stdout] 13 | / /** The main thread will wait for the spawned thread to finish and [INFO] [stdout] 14 | | then run its for loop, so the output won’t be interleaved anymore, pp. 394 */ [INFO] [stdout] | |_____________________________________________________________________________________^ [INFO] [stdout] 15 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v1` [INFO] [stdout] --> src/bin/chap13/2_closure_samples.rs:64:9 [INFO] [stdout] | [INFO] [stdout] 64 | let v1 = c.value(1); let v2 = c.value(2); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_v1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr1` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | addr1: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr2` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 5 | addr2: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr3` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | addr3: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `addr4` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:7:5 [INFO] [stdout] | [INFO] [stdout] 7 | addr4: u8, [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `address` [INFO] [stdout] --> src/bin/chap6/3_enum_sample.rs:13:5 [INFO] [stdout] | [INFO] [stdout] 13 | address: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::rc::Rc` [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use std::rc::Rc; [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:20:5 [INFO] [stdout] | [INFO] [stdout] 20 | / /** Mutex is smart pointer. [INFO] [stdout] 21 | | The call to lock returns a MutexGuard wrapped in a LockResult [INFO] [stdout] 22 | | that we handled with the call to unwrap. [INFO] [stdout] 23 | | [INFO] [stdout] ... | [INFO] [stdout] 29 | | blocking the mutex from being used by other threads [INFO] [stdout] 30 | | because the lock release happens automatically, pp. 408 */ [INFO] [stdout] | |__________________________________________________________________^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:34:5 [INFO] [stdout] | [INFO] [stdout] 34 | / /** Sharing a Mutex Between Multiple Threads, pp. 408 */ [INFO] [stdout] 35 | | /** Compile Error [INFO] [stdout] 36 | | The error message states that the counter value was moved [INFO] [stdout] 37 | | in the previous iteration of the loop. [INFO] [stdout] ... | [INFO] [stdout] 56 | /| /** [INFO] [stdout] 57 | || let counter = Rc::clone(&counter); [INFO] [stdout] 58 | || [INFO] [stdout] 59 | || let mut handles = vec![]; [INFO] [stdout] ... || [INFO] [stdout] 71 | || println!("Result: {}", *counter.lock().unwrap()); [INFO] [stdout] 72 | || */ [INFO] [stdout] | ||______^ [INFO] [stdout] | |_______| [INFO] [stdout] | rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:10:9 [INFO] [stdout] | [INFO] [stdout] 10 | / /** To access the data inside the mutex, we use the method to acquire the lock. [INFO] [stdout] 11 | | This call will block the current thread so it can’t do any work [INFO] [stdout] 12 | | until it’s our turn to have the lock. [INFO] [stdout] 13 | | [INFO] [stdout] 14 | | The call to lock would fail if another thread holding the lock panicked. [INFO] [stdout] 15 | | In that case, no one would ever be able to get the lock, [INFO] [stdout] 16 | | so we’ve chosen to unwrap and have this thread panic in that situation, pp. 407 */ [INFO] [stdout] | |______________________________________________________________________________________________^ [INFO] [stdout] 17 | let mut num: MutexGuard = m.lock().unwrap(); [INFO] [stdout] | ------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | / /** [INFO] [stdout] 7 | | * you can have only one mutable reference [INFO] [stdout] 8 | | * to a particular piece of data in a particular scope [INFO] [stdout] 9 | | * [INFO] [stdout] 10 | | * Code below will fail [INFO] [stdout] 11 | | */ [INFO] [stdout] | |______^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:19:13 [INFO] [stdout] | [INFO] [stdout] 19 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap4/5_mut_immut_references.rs:28:9 [INFO] [stdout] | [INFO] [stdout] 28 | let mut s = String::from("hello"); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/2_thread_samples.rs:18:5 [INFO] [stdout] | [INFO] [stdout] 18 | / /** Calling join on the handle blocks the thread currently running [INFO] [stdout] 19 | | until the thread represented by the handle terminates. [INFO] [stdout] 20 | | Blocking a thread means that thread is prevented from performing work or exiting. [INFO] [stdout] 21 | | [INFO] [stdout] 22 | | The two threads continue alternating, [INFO] [stdout] 23 | | but the main thread waits because of the call to handle.join() and [INFO] [stdout] 24 | | does not end until the spawned thread is nished., pp. 393 */ [INFO] [stdout] | |____________________________________________________________________^ [INFO] [stdout] 25 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:31:5 [INFO] [stdout] | [INFO] [stdout] 31 | /** We create an Rc instance holding a List value in the variable a with an initial list of 5, Nil. */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 32 | let a: Rc = Rc::new(Cons(5,RefCell::new(Rc::new(Nil)))); [INFO] [stdout] | -------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:36:5 [INFO] [stdout] | [INFO] [stdout] 36 | / /** We then create an Rc instance holding another List value in the variable b [INFO] [stdout] 37 | | that contains the value 10 and points to the list in a, pp. 381 */ [INFO] [stdout] | |__________________________________________________________________________^ [INFO] [stdout] 38 | let b: Rc = Rc::new(Cons(10,RefCell::new(Rc::clone(&a)))); [INFO] [stdout] | ---------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:43:5 [INFO] [stdout] | [INFO] [stdout] 43 | / /** We modify a so it points to b instead of Nil, creating a cycle. [INFO] [stdout] 44 | | We do that by using the tail method to get a reference to the RefCell>. [INFO] [stdout] 45 | | Then we use the borrow_mut method on the RefCell> to change the value inside from an Rc [INFO] [stdout] 46 | | that holds a Nil value to the Rc in b, pp. 381 */ [INFO] [stdout] | |_______________________________________________________________^ [INFO] [stdout] 47 | / if let Some(link) = a.tail() { [INFO] [stdout] 48 | | *link.borrow_mut() = Rc::clone(&b); [INFO] [stdout] 49 | | } [INFO] [stdout] | |_____- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | / /** The send function takes ownership of its parameter, [INFO] [stdout] 12 | | and when the value is moved, the receiver takes ownership of it. [INFO] [stdout] 13 | | This stops us from accidentally using the value again after sending it; [INFO] [stdout] 14 | | the ownership system checks that everything is okay, pp. 402 */ [INFO] [stdout] | |___________________________________________________________________________^ [INFO] [stdout] 15 | tx.send(val).unwrap(); [INFO] [stdout] | --------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:22:5 [INFO] [stdout] | [INFO] [stdout] 22 | / /** recv , short for receive, which will block the main thread’s execution and [INFO] [stdout] 23 | | wait until a value is sent down the channel. [INFO] [stdout] 24 | | Once a value is sent, recv will return it in a Result. [INFO] [stdout] 25 | | When the sending end of the channel closes, [INFO] [stdout] 26 | | recv will return an error to signal that no more values will be coming, pp. 401 */ [INFO] [stdout] | |__________________________________________________________________________________________^ [INFO] [stdout] 27 | let received = rx.recv().unwrap(); [INFO] [stdout] | ---------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:33:5 [INFO] [stdout] | [INFO] [stdout] 33 | / /** The spawned thread will now send multiple messages [INFO] [stdout] 34 | | and pause for a second between each message, pp. 403 */ [INFO] [stdout] | |_______________________________________________________________^ [INFO] [stdout] 35 | / thread::spawn(move || { [INFO] [stdout] 36 | | let vals = vec![ [INFO] [stdout] 37 | | String::from("hi"), [INFO] [stdout] 38 | | String::from("from"), [INFO] [stdout] ... | [INFO] [stdout] 48 | | } [INFO] [stdout] 49 | | }); [INFO] [stdout] | |______- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:42:9 [INFO] [stdout] | [INFO] [stdout] 42 | / /** We iterate over them, sending each individually, [INFO] [stdout] 43 | | and pause between each by calling the thread::sleep function [INFO] [stdout] 44 | | with a Duration value of 1 second */ [INFO] [stdout] | |________________________________________________^ [INFO] [stdout] 45 | / for val in vals { [INFO] [stdout] 46 | | tx.send(val).unwrap(); [INFO] [stdout] 47 | | thread::sleep(Duration::from_secs(1)); [INFO] [stdout] 48 | | } [INFO] [stdout] | |_________- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:51:5 [INFO] [stdout] | [INFO] [stdout] 51 | / /** Treating rx as an iterator [INFO] [stdout] 52 | | For each value received, we’re printing it. [INFO] [stdout] 53 | | When the channel is closed, iteration will end. */ [INFO] [stdout] | |__________________________________________________________^ [INFO] [stdout] 54 | / for received in rx { [INFO] [stdout] 55 | | println!("Got: {}", received); [INFO] [stdout] 56 | | } [INFO] [stdout] | |_____- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:61:5 [INFO] [stdout] | [INFO] [stdout] 61 | / /** Use mpsc to create multiple threads that all send values to the same receiver. [INFO] [stdout] 62 | | We can do so by cloning the transmitting half of the channel */ [INFO] [stdout] | |_______________________________________________________________________^ [INFO] [stdout] 63 | let tx1 = mpsc::Sender::clone(&tx); [INFO] [stdout] | ----------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap8/2_vec_immut_ref.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | let mut v = vec![1, 2, 3, 4, 5]; [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/chap9/2_result_recoverable_samples.rs:5:9 [INFO] [stdout] | [INFO] [stdout] 5 | let f = match f { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `kind` [INFO] [stdout] --> src/bin/chap6/1_enum_sample.rs:9:5 [INFO] [stdout] | [INFO] [stdout] 9 | kind: IpAddrKind, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `address` [INFO] [stdout] --> src/bin/chap6/1_enum_sample.rs:10:5 [INFO] [stdout] | [INFO] [stdout] 10 | address: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/bin/chap10/4_generic_trait_samples.rs:10:8 [INFO] [stdout] | [INFO] [stdout] 10 | fn new(x: T, y: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:3:13 [INFO] [stdout] | [INFO] [stdout] 3 | let mut s = String::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | let s = data.to_string(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let s = "initial contents".to_string(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | let s = String::from("initial contents"); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("السلام علیكم"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Dobrý den"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | let hello = String::from("Hello"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | let hello = String::from("Здравствуйте"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:22:9 [INFO] [stdout] | [INFO] [stdout] 22 | let hello = String::from("Hola"); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/chap8/4_string_samples.rs:3:9 [INFO] [stdout] | [INFO] [stdout] 3 | let mut s = String::new(); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:31:5 [INFO] [stdout] | [INFO] [stdout] 31 | /** We create an Rc instance holding a List value in the variable a with an initial list of 5, Nil. */ [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] 32 | let a: Rc = Rc::new(Cons(5,RefCell::new(Rc::new(Nil)))); [INFO] [stdout] | -------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:36:5 [INFO] [stdout] | [INFO] [stdout] 36 | / /** We then create an Rc instance holding another List value in the variable b [INFO] [stdout] 37 | | that contains the value 10 and points to the list in a, pp. 381 */ [INFO] [stdout] | |__________________________________________________________________________^ [INFO] [stdout] 38 | let b: Rc = Rc::new(Cons(10,RefCell::new(Rc::clone(&a)))); [INFO] [stdout] | ---------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/6_ref_cycle_samples.rs:43:5 [INFO] [stdout] | [INFO] [stdout] 43 | / /** We modify a so it points to b instead of Nil, creating a cycle. [INFO] [stdout] 44 | | We do that by using the tail method to get a reference to the RefCell>. [INFO] [stdout] 45 | | Then we use the borrow_mut method on the RefCell> to change the value inside from an Rc [INFO] [stdout] 46 | | that holds a Nil value to the Rc in b, pp. 381 */ [INFO] [stdout] | |_______________________________________________________________^ [INFO] [stdout] 47 | / if let Some(link) = a.tail() { [INFO] [stdout] 48 | | *link.borrow_mut() = Rc::clone(&b); [INFO] [stdout] 49 | | } [INFO] [stdout] | |_____- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::rc::Rc` [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use std::rc::Rc; [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:20:5 [INFO] [stdout] | [INFO] [stdout] 20 | / /** Mutex is smart pointer. [INFO] [stdout] 21 | | The call to lock returns a MutexGuard wrapped in a LockResult [INFO] [stdout] 22 | | that we handled with the call to unwrap. [INFO] [stdout] 23 | | [INFO] [stdout] ... | [INFO] [stdout] 29 | | blocking the mutex from being used by other threads [INFO] [stdout] 30 | | because the lock release happens automatically, pp. 408 */ [INFO] [stdout] | |__________________________________________________________________^ rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:34:5 [INFO] [stdout] | [INFO] [stdout] 34 | / /** Sharing a Mutex Between Multiple Threads, pp. 408 */ [INFO] [stdout] 35 | | /** Compile Error [INFO] [stdout] 36 | | The error message states that the counter value was moved [INFO] [stdout] 37 | | in the previous iteration of the loop. [INFO] [stdout] ... | [INFO] [stdout] 56 | /| /** [INFO] [stdout] 57 | || let counter = Rc::clone(&counter); [INFO] [stdout] 58 | || [INFO] [stdout] 59 | || let mut handles = vec![]; [INFO] [stdout] ... || [INFO] [stdout] 71 | || println!("Result: {}", *counter.lock().unwrap()); [INFO] [stdout] 72 | || */ [INFO] [stdout] | ||______^ [INFO] [stdout] | |_______| [INFO] [stdout] | rustdoc does not generate documentation for macro invocations [INFO] [stdout] | [INFO] [stdout] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/6_mutex_samples.rs:10:9 [INFO] [stdout] | [INFO] [stdout] 10 | / /** To access the data inside the mutex, we use the method to acquire the lock. [INFO] [stdout] 11 | | This call will block the current thread so it can’t do any work [INFO] [stdout] 12 | | until it’s our turn to have the lock. [INFO] [stdout] 13 | | [INFO] [stdout] 14 | | The call to lock would fail if another thread holding the lock panicked. [INFO] [stdout] 15 | | In that case, no one would ever be able to get the lock, [INFO] [stdout] 16 | | so we’ve chosen to unwrap and have this thread panic in that situation, pp. 407 */ [INFO] [stdout] | |______________________________________________________________________________________________^ [INFO] [stdout] 17 | let mut num: MutexGuard = m.lock().unwrap(); [INFO] [stdout] | ------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `shoes_in_my_size` [INFO] [stdout] --> src/bin/chap13/5_closure_iter_samples.rs:9:4 [INFO] [stdout] | [INFO] [stdout] 9 | fn shoes_in_my_size(shoes: Vec, shoe_size: u32) -> Vec { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:24 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `u` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:31 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:60:5 [INFO] [stdout] | [INFO] [stdout] 60 | / /** Compile error. [INFO] [stdout] 61 | | The error shows this type “has infnite size.” [INFO] [stdout] 62 | | The reason is that we’ve defined List with a variant that is recursive: [INFO] [stdout] 63 | | it holds another value of itself directly. [INFO] [stdout] 64 | | As a result, Rust can’t figure out how much space it needs to store a List value. */ [INFO] [stdout] | |____________________________________________________________________________________________^ [INFO] [stdout] ... [INFO] [stdout] 68 | / let list: ListBox = Cons(1, [INFO] [stdout] 69 | | Box::new(Cons(2, [INFO] [stdout] 70 | | Box::new(Cons(3, [INFO] [stdout] 71 | | Box::new(Nil)))))); [INFO] [stdout] | |___________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:75:5 [INFO] [stdout] | [INFO] [stdout] 75 | / /** Following the Pointer to the Value with the Dereference Operator, pp. 354 [INFO] [stdout] 76 | | The variable x holds an i32 value, 5. [INFO] [stdout] 77 | | We set y equal to a reference to x. We can assert that x is equal to 5. [INFO] [stdout] 78 | | However, if we want to make an assertion about the value in y, [INFO] [stdout] 79 | | we have to use *y to follow the reference to the value it’s pointing to (hence dereference). [INFO] [stdout] 80 | | Once we dereference y, we have access to the integer value y is pointing to [INFO] [stdout] 81 | | that we can compare with 5, pp. 355 */ [INFO] [stdout] | |______________________________________________^ [INFO] [stdout] 82 | let x = 5; [INFO] [stdout] | ---------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:104:5 [INFO] [stdout] | [INFO] [stdout] 104 | / /** [INFO] [stdout] 105 | | * Implicit Deref Coercions with Functions and Methods, pp. 359 */ [INFO] [stdout] | |______________________________________________________________________^ [INFO] [stdout] 106 | // call the hello function with a string slice as an argument, pp. 359 [INFO] [stdout] 107 | hello("Rust1"); [INFO] [stdout] | -------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:115:5 [INFO] [stdout] | [INFO] [stdout] 115 | / /** If Rust didn’t implement deref coercion, [INFO] [stdout] 116 | | we would have to write the code like below instead, [INFO] [stdout] 117 | | to call hello with a value of type &MyBox, pp. 359 [INFO] [stdout] 118 | | */ [INFO] [stdout] | |______^ [INFO] [stdout] 119 | let m = MyBox::new(String::from("Rust3")); [INFO] [stdout] | ------------------------------------------ rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/1_box_samples.rs:120:5 [INFO] [stdout] | [INFO] [stdout] 120 | / /** The (*m) dereferences the MyBox into a String . [INFO] [stdout] 121 | | Then the & and take a string slice of the String [INFO] [stdout] 122 | | that is equal to the whole string to match the signature of hello, pp. 360 */ [INFO] [stdout] | |_____________________________________________________________________________________^ [INFO] [stdout] 123 | hello(&(*m)[..]); [INFO] [stdout] | ---------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function` [INFO] [stdout] --> src/bin/chap10/2_trait_samples.rs:57:4 [INFO] [stdout] | [INFO] [stdout] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/chap9/2_result_recoverable_samples.rs:5:9 [INFO] [stdout] | [INFO] [stdout] 5 | let f = match f { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_string` [INFO] [stdout] --> src/bin/chap4/4_reference_borrowing.rs:28:17 [INFO] [stdout] | [INFO] [stdout] 28 | fn change_immut(some_string: &String) { [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | let c = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `d` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let d = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_d` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/bin/chap15/2_drop_samples.rs:22:9 [INFO] [stdout] | [INFO] [stdout] 22 | let c = CustomSmartPointer { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/3_thread_samples.rs:13:5 [INFO] [stdout] | [INFO] [stdout] 13 | / /** The main thread will wait for the spawned thread to finish and [INFO] [stdout] 14 | | then run its for loop, so the output won’t be interleaved anymore, pp. 394 */ [INFO] [stdout] | |_____________________________________________________________________________________^ [INFO] [stdout] 15 | handle.join().unwrap(); [INFO] [stdout] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/bin/chap13/6_create_own_iter_samples.rs:6:8 [INFO] [stdout] | [INFO] [stdout] 6 | fn new() -> Counter { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:64:5 [INFO] [stdout] | [INFO] [stdout] 64 | / /** This won't compile, pp. 220 [INFO] [stdout] 65 | | let result; [INFO] [stdout] 66 | | { [INFO] [stdout] 67 | | let string2 = String::from("xyz"); [INFO] [stdout] ... | [INFO] [stdout] 70 | | println!("The longest string is {}", result); [INFO] [stdout] 71 | | */ [INFO] [stdout] | |______^ [INFO] [stdout] 72 | [INFO] [stdout] 73 | let string1 = String::from("abcd"); [INFO] [stdout] | ----------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:27:30 [INFO] [stdout] | [INFO] [stdout] 27 | fn longest_x<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `string1` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let string1 = String::from("long string is long"); [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `longest_x` [INFO] [stdout] --> src/bin/chap10/5_lifetime_generic_samples.rs:27:4 [INFO] [stdout] | [INFO] [stdout] 27 | fn longest_x<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 10 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:12:4 [INFO] [stdout] | [INFO] [stdout] 12 | fn read_username_from_file() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file2` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:29:4 [INFO] [stdout] | [INFO] [stdout] 29 | fn read_username_from_file2() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `read_username_from_file3` [INFO] [stdout] --> src/bin/chap9/4_propagating_error.rs:38:4 [INFO] [stdout] | [INFO] [stdout] 38 | fn read_username_from_file3() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/chap9/3_result_matching_samples.rs:43:9 [INFO] [stdout] | [INFO] [stdout] 43 | let f = File::open("hello2.txt") [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | / /** The send function takes ownership of its parameter, [INFO] [stdout] 12 | | and when the value is moved, the receiver takes ownership of it. [INFO] [stdout] 13 | | This stops us from accidentally using the value again after sending it; [INFO] [stdout] 14 | | the ownership system checks that everything is okay, pp. 402 */ [INFO] [stdout] | |___________________________________________________________________________^ [INFO] [stdout] 15 | tx.send(val).unwrap(); [INFO] [stdout] | --------------------- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:22:5 [INFO] [stdout] | [INFO] [stdout] 22 | / /** recv , short for receive, which will block the main thread’s execution and [INFO] [stdout] 23 | | wait until a value is sent down the channel. [INFO] [stdout] 24 | | Once a value is sent, recv will return it in a Result. [INFO] [stdout] 25 | | When the sending end of the channel closes, [INFO] [stdout] 26 | | recv will return an error to signal that no more values will be coming, pp. 401 */ [INFO] [stdout] | |__________________________________________________________________________________________^ [INFO] [stdout] 27 | let received = rx.recv().unwrap(); [INFO] [stdout] | ---------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:33:5 [INFO] [stdout] | [INFO] [stdout] 33 | / /** The spawned thread will now send multiple messages [INFO] [stdout] 34 | | and pause for a second between each message, pp. 403 */ [INFO] [stdout] | |_______________________________________________________________^ [INFO] [stdout] 35 | / thread::spawn(move || { [INFO] [stdout] 36 | | let vals = vec![ [INFO] [stdout] 37 | | String::from("hi"), [INFO] [stdout] 38 | | String::from("from"), [INFO] [stdout] ... | [INFO] [stdout] 48 | | } [INFO] [stdout] 49 | | }); [INFO] [stdout] | |______- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:42:9 [INFO] [stdout] | [INFO] [stdout] 42 | / /** We iterate over them, sending each individually, [INFO] [stdout] 43 | | and pause between each by calling the thread::sleep function [INFO] [stdout] 44 | | with a Duration value of 1 second */ [INFO] [stdout] | |________________________________________________^ [INFO] [stdout] 45 | / for val in vals { [INFO] [stdout] 46 | | tx.send(val).unwrap(); [INFO] [stdout] 47 | | thread::sleep(Duration::from_secs(1)); [INFO] [stdout] 48 | | } [INFO] [stdout] | |_________- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:51:5 [INFO] [stdout] | [INFO] [stdout] 51 | / /** Treating rx as an iterator [INFO] [stdout] 52 | | For each value received, we’re printing it. [INFO] [stdout] 53 | | When the channel is closed, iteration will end. */ [INFO] [stdout] | |__________________________________________________________^ [INFO] [stdout] 54 | / for received in rx { [INFO] [stdout] 55 | | println!("Got: {}", received); [INFO] [stdout] 56 | | } [INFO] [stdout] | |_____- rustdoc does not generate documentation for expressions [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap16/5_channel_thread_samples.rs:61:5 [INFO] [stdout] | [INFO] [stdout] 61 | / /** Use mpsc to create multiple threads that all send values to the same receiver. [INFO] [stdout] 62 | | We can do so by cloning the transmitting half of the channel */ [INFO] [stdout] | |_______________________________________________________________________^ [INFO] [stdout] 63 | let tx1 = mpsc::Sender::clone(&tx); [INFO] [stdout] | ----------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused doc comment [INFO] [stdout] --> src/bin/chap15/4_refcell_samples.rs:76:13 [INFO] [stdout] | [INFO] [stdout] 76 | / /** We can’t modify the to keep track of the messages, [INFO] [stdout] 77 | | because the send method takes an immutable reference to self, pp. 374. */ [INFO] [stdout] 78 | | // self.sent_messages.push(String::from(message)); [INFO] [stdout] 79 | | [INFO] [stdout] ... | [INFO] [stdout] 82 | | Then we can call push on the mutable reference to the vector [INFO] [stdout] 83 | | to keep track of the messages sent during the test, pp. 375 */ [INFO] [stdout] | |______________________________________________________________________________^ [INFO] [stdout] 84 | let mut one_borrow: RefMut> = self.sent_messages.borrow_mut(); [INFO] [stdout] | -------------------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stdout] = help: use `/* */` for a plain comment [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 20.22s [INFO] running `Command { std: "docker" "inspect" "3e95ce09642353999e8bf9423c9f05b47c0b5e46a0180b7d4253df7bc87262fa", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3e95ce09642353999e8bf9423c9f05b47c0b5e46a0180b7d4253df7bc87262fa", kill_on_drop: false }` [INFO] [stdout] 3e95ce09642353999e8bf9423c9f05b47c0b5e46a0180b7d4253df7bc87262fa [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] b96c469d8a87cc80d43d077bcba73467044b0267767fcfdaf590055b69714018 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "b96c469d8a87cc80d43d077bcba73467044b0267767fcfdaf590055b69714018", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] warning: unused variable: `order1` [INFO] [stderr] --> src/lib.rs:57:9 [INFO] [stderr] | [INFO] [stderr] 57 | let order1 = back_of_house::Appetizer::Soup; [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `order2` [INFO] [stderr] --> src/lib.rs:58:9 [INFO] [stderr] | [INFO] [stderr] 58 | let order2 = back_of_house::Appetizer::Salad; [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2` [INFO] [stderr] [INFO] [stderr] warning: function is never used: `seat_at_table` [INFO] [stderr] --> src/front_of_house/hosting.rs:2:4 [INFO] [stderr] | [INFO] [stderr] 2 | fn seat_at_table() {} [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `take_order` [INFO] [stderr] --> src/front_of_house.rs:4:8 [INFO] [stderr] | [INFO] [stderr] 4 | fn take_order() {} [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `serve_order` [INFO] [stderr] --> src/front_of_house.rs:5:8 [INFO] [stderr] | [INFO] [stderr] 5 | fn serve_order() {} [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `take_payment` [INFO] [stderr] --> src/front_of_house.rs:6:8 [INFO] [stderr] | [INFO] [stderr] 6 | fn take_payment() {} [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `serve_order` [INFO] [stderr] --> src/lib.rs:16:4 [INFO] [stderr] | [INFO] [stderr] 16 | fn serve_order() {} [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never read: `seasonal_fruit` [INFO] [stderr] --> src/lib.rs:21:9 [INFO] [stderr] | [INFO] [stderr] 21 | seasonal_fruit: String, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `cook_order` [INFO] [stderr] --> src/lib.rs:33:8 [INFO] [stderr] | [INFO] [stderr] 33 | fn cook_order() {} [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `fix_incorrect_order` [INFO] [stderr] --> src/lib.rs:34:8 [INFO] [stderr] | [INFO] [stderr] 34 | fn fix_incorrect_order() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: `rust_prog_lang` (lib) generated 10 warnings [INFO] [stderr] warning: `rust_prog_lang` (lib test) generated 10 warnings (10 duplicates) [INFO] [stderr] warning: associated function is never used: `new` [INFO] [stderr] --> src/bin/chap10/4_generic_trait_samples.rs:10:8 [INFO] [stderr] | [INFO] [stderr] 10 | fn new(x: T, y: T) -> Self { [INFO] [stderr] | ^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `new` [INFO] [stderr] --> src/bin/chap13/6_create_own_iter_samples.rs:6:8 [INFO] [stderr] | [INFO] [stderr] 6 | fn new() -> Counter { [INFO] [stderr] | ^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `shoes_in_my_size` [INFO] [stderr] --> src/bin/chap13/5_closure_iter_samples.rs:9:4 [INFO] [stderr] | [INFO] [stderr] 9 | fn shoes_in_my_size(shoes: Vec, shoe_size: u32) -> Vec { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/bin/chap10/2_trait_samples.rs:57:24 [INFO] [stderr] | [INFO] [stderr] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `u` [INFO] [stderr] --> src/bin/chap10/2_trait_samples.rs:57:31 [INFO] [stderr] | [INFO] [stderr] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stderr] [INFO] [stderr] warning: function is never used: `some_function` [INFO] [stderr] --> src/bin/chap10/2_trait_samples.rs:57:4 [INFO] [stderr] | [INFO] [stderr] 57 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `name` [INFO] [stderr] --> src/bin/chap11/1_test_samples.rs:9:18 [INFO] [stderr] | [INFO] [stderr] 9 | pub fn greeting2(name: &str) -> String { [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_name` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `value` [INFO] [stderr] --> src/bin/chap11/1_test_samples.rs:14:5 [INFO] [stderr] | [INFO] [stderr] 14 | value: i32, [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: method `newB` should have a snake case name [INFO] [stderr] --> src/bin/chap11/1_test_samples.rs:24:12 [INFO] [stderr] | [INFO] [stderr] 24 | pub fn newB(value: i32) -> Guess { [INFO] [stderr] | ^^^^ help: convert the identifier to snake case: `new_b` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `y` [INFO] [stderr] --> src/bin/chap10/1_generic_samples.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | y: T, [INFO] [stderr] | ^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `distance_from_origin` [INFO] [stderr] --> src/bin/chap10/1_generic_samples.rs:12:8 [INFO] [stderr] | [INFO] [stderr] 12 | fn distance_from_origin(&self) -> f32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap10/5_lifetime_generic_samples.rs:64:5 [INFO] [stderr] | [INFO] [stderr] 64 | / /** This won't compile, pp. 220 [INFO] [stderr] 65 | | let result; [INFO] [stderr] 66 | | { [INFO] [stderr] 67 | | let string2 = String::from("xyz"); [INFO] [stderr] ... | [INFO] [stderr] 70 | | println!("The longest string is {}", result); [INFO] [stderr] 71 | | */ [INFO] [stderr] | |______^ [INFO] [stderr] 72 | [INFO] [stderr] 73 | let string1 = String::from("abcd"); [INFO] [stderr] | ----------------------------------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/bin/chap10/5_lifetime_generic_samples.rs:27:30 [INFO] [stderr] | [INFO] [stderr] 27 | fn longest_x<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `string1` [INFO] [stderr] --> src/bin/chap10/5_lifetime_generic_samples.rs:63:9 [INFO] [stderr] | [INFO] [stderr] 63 | let string1 = String::from("long string is long"); [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1` [INFO] [stderr] [INFO] [stderr] warning: function is never used: `longest_x` [INFO] [stderr] --> src/bin/chap10/5_lifetime_generic_samples.rs:27:4 [INFO] [stderr] | [INFO] [stderr] 27 | fn longest_x<'a>(x: &'a str, y: &str) -> &'a str { [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: value assigned to `s2` is never read [INFO] [stderr] --> src/bin/chap4/1_variable_scope.rs:7:13 [INFO] [stderr] | [INFO] [stderr] 7 | let mut s2 = "hello world!"; [INFO] [stderr] | ^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_assignments)]` on by default [INFO] [stderr] = help: maybe it is overwritten before being read? [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/bin/chap9/3_result_matching_samples.rs:43:9 [INFO] [stderr] | [INFO] [stderr] 43 | let f = File::open("hello2.txt") [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/bin/chap9/2_result_recoverable_samples.rs:5:9 [INFO] [stderr] | [INFO] [stderr] 5 | let f = match f { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: `rust_prog_lang` (bin "4_generic_trait_samples" test) generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "6_create_own_iter_samples") generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "5_closure_iter_samples") generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "2_trait_samples") generated 3 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "1_test_samples") generated 3 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "1_generic_samples") generated 2 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "5_lifetime_generic_samples" test) generated 4 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "1_variable_scope") generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "3_result_matching_samples") generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "2_result_recoverable_samples") generated 1 warning [INFO] [stderr] warning: field is never read: `kind` [INFO] [stderr] --> src/bin/chap6/1_enum_sample.rs:9:5 [INFO] [stderr] | [INFO] [stderr] 9 | kind: IpAddrKind, [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `address` [INFO] [stderr] --> src/bin/chap6/1_enum_sample.rs:10:5 [INFO] [stderr] | [INFO] [stderr] 10 | address: String, [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/3_thread_samples.rs:13:5 [INFO] [stderr] | [INFO] [stderr] 13 | / /** The main thread will wait for the spawned thread to finish and [INFO] [stderr] 14 | | then run its for loop, so the output won’t be interleaved anymore, pp. 394 */ [INFO] [stderr] | |_____________________________________________________________________________________^ [INFO] [stderr] 15 | handle.join().unwrap(); [INFO] [stderr] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused variable: `word` [INFO] [stderr] --> src/bin/chap4/7_string_slices.rs:3:9 [INFO] [stderr] | [INFO] [stderr] 3 | let word = first_word(&s); // word will get the value 5 [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: type `List_Box` should have an upper camel case name [INFO] [stderr] --> src/bin/chap15/3_rc_samples.rs:2:6 [INFO] [stderr] | [INFO] [stderr] 2 | enum List_Box { [INFO] [stderr] | ^^^^^^^^ help: convert the identifier to upper camel case: `ListBox` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_camel_case_types)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/3_rc_samples.rs:21:5 [INFO] [stderr] | [INFO] [stderr] 21 | / /** The Cons variants own the data they hold, so when we create the b list, [INFO] [stderr] 22 | | a is moved into b and b owns a. Then, when we try to use a again when creating c, [INFO] [stderr] 23 | | we’re not allowed to because a has been moved, pp. 366 [INFO] [stderr] 24 | | */ [INFO] [stderr] | |______^ rustdoc does not generate documentation for macro invocations [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/3_rc_samples.rs:16:5 [INFO] [stderr] | [INFO] [stderr] 16 | /** Box allows immutable or mutable borrows checked at compile time, pp. 370 */ [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] 17 | / let a = List_Box::Cons(5, [INFO] [stderr] 18 | | Box::new(List_Box::Cons(10, [INFO] [stderr] 19 | | Box::new(List_Box::Nil)))); [INFO] [stderr] | |______________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/3_rc_samples.rs:29:5 [INFO] [stderr] | [INFO] [stderr] 29 | / /** pp 370 [INFO] [stderr] 30 | | - Rc ENABLES MULTIPLE OWNERS of the same data, [INFO] [stderr] 31 | | while Box and RefCell have single owners [INFO] [stderr] 32 | | - Rc allows only IMMUTABLE borrows checked at compile time [INFO] [stderr] 33 | | */ [INFO] [stderr] | |__________^ [INFO] [stderr] 34 | / let a: Rc = Rc::new(List::Cons(5, [INFO] [stderr] 35 | | Rc::new(List::Cons(10, [INFO] [stderr] 36 | | Rc::new(List::Nil))))); [INFO] [stderr] | |_________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/3_rc_samples.rs:37:5 [INFO] [stderr] | [INFO] [stderr] 37 | / /** The implementation of Rc::clone doesn’t make a deep copy of all the data [INFO] [stderr] 38 | | like most types’ implementations of clone do. [INFO] [stderr] 39 | | The call to Rc::clone only increments the reference count, which doesn’t take much time. [INFO] [stderr] 40 | | Deep copies of data can take a lot of time, pp. 367 */ [INFO] [stderr] | |______________________________________________________________^ [INFO] [stderr] 41 | let b = List::Cons(3, Rc::clone(&a)); [INFO] [stderr] | ------------------------------------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/3_rc_samples.rs:48:5 [INFO] [stderr] | [INFO] [stderr] 48 | /** Printing the reference count, pp. 368 */ [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] 49 | / let a = Rc::new(List::Cons(5, [INFO] [stderr] 50 | | Rc::new(List::Cons(10, [INFO] [stderr] 51 | | Rc::new(List::Nil))))); [INFO] [stderr] | |_________________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused variable: `b` [INFO] [stderr] --> src/bin/chap15/3_rc_samples.rs:53:9 [INFO] [stderr] | [INFO] [stderr] 53 | let b = List::Cons(3, Rc::clone(&a)); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c` [INFO] [stderr] --> src/bin/chap15/3_rc_samples.rs:56:13 [INFO] [stderr] | [INFO] [stderr] 56 | let c = List::Cons(4, Rc::clone(&a)); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c` [INFO] [stderr] --> src/bin/chap15/2_drop_samples.rs:13:9 [INFO] [stderr] | [INFO] [stderr] 13 | let c = CustomSmartPointer { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `d` [INFO] [stderr] --> src/bin/chap15/2_drop_samples.rs:16:9 [INFO] [stderr] | [INFO] [stderr] 16 | let d = CustomSmartPointer { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_d` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c` [INFO] [stderr] --> src/bin/chap15/2_drop_samples.rs:22:9 [INFO] [stderr] | [INFO] [stderr] 22 | let c = CustomSmartPointer { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::rc::Rc` [INFO] [stderr] --> src/bin/chap16/6_mutex_samples.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use std::rc::Rc; [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/6_mutex_samples.rs:20:5 [INFO] [stderr] | [INFO] [stderr] 20 | / /** Mutex is smart pointer. [INFO] [stderr] 21 | | The call to lock returns a MutexGuard wrapped in a LockResult [INFO] [stderr] 22 | | that we handled with the call to unwrap. [INFO] [stderr] 23 | | [INFO] [stderr] ... | [INFO] [stderr] 29 | | blocking the mutex from being used by other threads [INFO] [stderr] 30 | | because the lock release happens automatically, pp. 408 */ [INFO] [stderr] | |__________________________________________________________________^ rustdoc does not generate documentation for macro invocations [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/6_mutex_samples.rs:34:5 [INFO] [stderr] | [INFO] [stderr] 34 | / /** Sharing a Mutex Between Multiple Threads, pp. 408 */ [INFO] [stderr] 35 | | /** Compile Error [INFO] [stderr] 36 | | The error message states that the counter value was moved [INFO] [stderr] 37 | | in the previous iteration of the loop. [INFO] [stderr] ... | [INFO] [stderr] 56 | /| /** [INFO] [stderr] 57 | || let counter = Rc::clone(&counter); [INFO] [stderr] 58 | || [INFO] [stderr] 59 | || let mut handles = vec![]; [INFO] [stderr] ... || [INFO] [stderr] 71 | || println!("Result: {}", *counter.lock().unwrap()); [INFO] [stderr] 72 | || */ [INFO] [stderr] | ||______^ [INFO] [stderr] | |_______| [INFO] [stderr] | rustdoc does not generate documentation for macro invocations [INFO] [stderr] | [INFO] [stderr] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/6_mutex_samples.rs:10:9 [INFO] [stderr] | [INFO] [stderr] 10 | / /** To access the data inside the mutex, we use the method to acquire the lock. [INFO] [stderr] 11 | | This call will block the current thread so it can’t do any work [INFO] [stderr] 12 | | until it’s our turn to have the lock. [INFO] [stderr] 13 | | [INFO] [stderr] 14 | | The call to lock would fail if another thread holding the lock panicked. [INFO] [stderr] 15 | | In that case, no one would ever be able to get the lock, [INFO] [stderr] 16 | | so we’ve chosen to unwrap and have this thread panic in that situation, pp. 407 */ [INFO] [stderr] | |______________________________________________________________________________________________^ [INFO] [stderr] 17 | let mut num: MutexGuard = m.lock().unwrap(); [INFO] [stderr] | ------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/5_channel_thread_samples.rs:11:9 [INFO] [stderr] | [INFO] [stderr] 11 | / /** The send function takes ownership of its parameter, [INFO] [stderr] 12 | | and when the value is moved, the receiver takes ownership of it. [INFO] [stderr] 13 | | This stops us from accidentally using the value again after sending it; [INFO] [stderr] 14 | | the ownership system checks that everything is okay, pp. 402 */ [INFO] [stderr] | |___________________________________________________________________________^ [INFO] [stderr] 15 | tx.send(val).unwrap(); [INFO] [stderr] | --------------------- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/5_channel_thread_samples.rs:22:5 [INFO] [stderr] | [INFO] [stderr] 22 | / /** recv , short for receive, which will block the main thread’s execution and [INFO] [stderr] 23 | | wait until a value is sent down the channel. [INFO] [stderr] 24 | | Once a value is sent, recv will return it in a Result. [INFO] [stderr] 25 | | When the sending end of the channel closes, [INFO] [stderr] 26 | | recv will return an error to signal that no more values will be coming, pp. 401 */ [INFO] [stderr] | |__________________________________________________________________________________________^ [INFO] [stderr] 27 | let received = rx.recv().unwrap(); [INFO] [stderr] | ---------------------------------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/5_channel_thread_samples.rs:33:5 [INFO] [stderr] | [INFO] [stderr] 33 | / /** The spawned thread will now send multiple messages [INFO] [stderr] 34 | | and pause for a second between each message, pp. 403 */ [INFO] [stderr] | |_______________________________________________________________^ [INFO] [stderr] 35 | / thread::spawn(move || { [INFO] [stderr] 36 | | let vals = vec![ [INFO] [stderr] 37 | | String::from("hi"), [INFO] [stderr] 38 | | String::from("from"), [INFO] [stderr] ... | [INFO] [stderr] 48 | | } [INFO] [stderr] 49 | | }); [INFO] [stderr] | |______- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/5_channel_thread_samples.rs:42:9 [INFO] [stderr] | [INFO] [stderr] 42 | / /** We iterate over them, sending each individually, [INFO] [stderr] 43 | | and pause between each by calling the thread::sleep function [INFO] [stderr] 44 | | with a Duration value of 1 second */ [INFO] [stderr] | |________________________________________________^ [INFO] [stderr] 45 | / for val in vals { [INFO] [stderr] 46 | | tx.send(val).unwrap(); [INFO] [stderr] 47 | | thread::sleep(Duration::from_secs(1)); [INFO] [stderr] 48 | | } [INFO] [stderr] | |_________- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/5_channel_thread_samples.rs:51:5 [INFO] [stderr] | [INFO] [stderr] 51 | / /** Treating rx as an iterator [INFO] [stderr] 52 | | For each value received, we’re printing it. [INFO] [stderr] 53 | | When the channel is closed, iteration will end. */ [INFO] [stderr] | |__________________________________________________________^ [INFO] [stderr] 54 | / for received in rx { [INFO] [stderr] 55 | | println!("Got: {}", received); [INFO] [stderr] 56 | | } [INFO] [stderr] | |_____- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/5_channel_thread_samples.rs:61:5 [INFO] [stderr] | [INFO] [stderr] 61 | / /** Use mpsc to create multiple threads that all send values to the same receiver. [INFO] [stderr] 62 | | We can do so by cloning the transmitting half of the channel */ [INFO] [stderr] | |_______________________________________________________________________^ [INFO] [stderr] 63 | let tx1 = mpsc::Sender::clone(&tx); [INFO] [stderr] | ----------------------------------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: `rust_prog_lang` (bin "1_enum_sample") generated 2 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "3_thread_samples" test) generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "7_string_slices") generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "3_rc_samples") generated 8 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "2_drop_samples") generated 3 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "6_mutex_samples" test) generated 4 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "5_channel_thread_samples") generated 6 warnings [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/2_thread_samples.rs:18:5 [INFO] [stderr] | [INFO] [stderr] 18 | / /** Calling join on the handle blocks the thread currently running [INFO] [stderr] 19 | | until the thread represented by the handle terminates. [INFO] [stderr] 20 | | Blocking a thread means that thread is prevented from performing work or exiting. [INFO] [stderr] 21 | | [INFO] [stderr] 22 | | The two threads continue alternating, [INFO] [stderr] 23 | | but the main thread waits because of the call to handle.join() and [INFO] [stderr] 24 | | does not end until the spawned thread is nished., pp. 393 */ [INFO] [stderr] | |____________________________________________________________________^ [INFO] [stderr] 25 | handle.join().unwrap(); [INFO] [stderr] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: field is never read: `addr1` [INFO] [stderr] --> src/bin/chap6/3_enum_sample.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | addr1: u8, [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `addr2` [INFO] [stderr] --> src/bin/chap6/3_enum_sample.rs:5:5 [INFO] [stderr] | [INFO] [stderr] 5 | addr2: u8, [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never read: `addr3` [INFO] [stderr] --> src/bin/chap6/3_enum_sample.rs:6:5 [INFO] [stderr] | [INFO] [stderr] 6 | addr3: u8, [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never read: `addr4` [INFO] [stderr] --> src/bin/chap6/3_enum_sample.rs:7:5 [INFO] [stderr] | [INFO] [stderr] 7 | addr4: u8, [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never read: `address` [INFO] [stderr] --> src/bin/chap6/3_enum_sample.rs:13:5 [INFO] [stderr] | [INFO] [stderr] 13 | address: String, [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap4/5_mut_immut_references.rs:6:5 [INFO] [stderr] | [INFO] [stderr] 6 | / /** [INFO] [stderr] 7 | | * you can have only one mutable reference [INFO] [stderr] 8 | | * to a particular piece of data in a particular scope [INFO] [stderr] 9 | | * [INFO] [stderr] 10 | | * Code below will fail [INFO] [stderr] 11 | | */ [INFO] [stderr] | |______^ rustdoc does not generate documentation for macro invocations [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/bin/chap4/5_mut_immut_references.rs:19:13 [INFO] [stderr] | [INFO] [stderr] 19 | let r1 = &mut s; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/bin/chap4/5_mut_immut_references.rs:28:9 [INFO] [stderr] | [INFO] [stderr] 28 | let mut s = String::from("hello"); [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file` [INFO] [stderr] --> src/bin/chap9/4_propagating_error.rs:12:4 [INFO] [stderr] | [INFO] [stderr] 12 | fn read_username_from_file() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file2` [INFO] [stderr] --> src/bin/chap9/4_propagating_error.rs:29:4 [INFO] [stderr] | [INFO] [stderr] 29 | fn read_username_from_file2() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `read_username_from_file3` [INFO] [stderr] --> src/bin/chap9/4_propagating_error.rs:38:4 [INFO] [stderr] | [INFO] [stderr] 38 | fn read_username_from_file3() -> Result { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: `rust_prog_lang` (bin "2_thread_samples" test) generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "3_enum_sample" test) generated 5 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "5_mut_immut_references") generated 3 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "5_lifetime_generic_samples") generated 4 warnings (4 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "4_propagating_error") generated 3 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "3_rc_samples" test) generated 8 warnings (8 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "2_thread_samples") generated 1 warning (1 duplicate) [INFO] [stderr] warning: unused variable: `list` [INFO] [stderr] --> src/bin/chap10/3_generic_trait_samples.rs:21:24 [INFO] [stderr] | [INFO] [stderr] 21 | fn largest_not_work(list: &[T]) -> T { [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_list` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `largest_not_work` [INFO] [stderr] --> src/bin/chap10/3_generic_trait_samples.rs:21:4 [INFO] [stderr] | [INFO] [stderr] 21 | fn largest_not_work(list: &[T]) -> T { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `some_string` [INFO] [stderr] --> src/bin/chap4/4_reference_borrowing.rs:28:17 [INFO] [stderr] | [INFO] [stderr] 28 | fn change_immut(some_string: &String) { [INFO] [stderr] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::time::Duration` [INFO] [stderr] --> src/bin/chap16/4_closure_thread_samples.rs:2:5 [INFO] [stderr] | [INFO] [stderr] 2 | use std::time::Duration; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/4_closure_thread_samples.rs:9:5 [INFO] [stderr] | [INFO] [stderr] 9 | / /** The closure uses v, so it will capture v and make it part of the closure’s environment. [INFO] [stderr] 10 | | Because thread::spawn runs this closure in a new thread, [INFO] [stderr] 11 | | we should be able to access v inside that new thread. */ [INFO] [stderr] 12 | | /** Compile ERROR [INFO] [stderr] ... | [INFO] [stderr] 31 | | we force the closure to take ownership of the values it’s using [INFO] [stderr] 32 | | rather than allowing Rust to infer that it should borrow the values, pp. 397 */ [INFO] [stderr] | |_______________________________________________________________________________________^ [INFO] [stderr] 33 | / let handle: JoinHandle<()> = thread::spawn(move || { [INFO] [stderr] 34 | | println!("Here's a vector: {:?}", v); [INFO] [stderr] 35 | | }); [INFO] [stderr] | |_______- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap16/4_closure_thread_samples.rs:37:5 [INFO] [stderr] | [INFO] [stderr] 37 | / /** If we added move to the closure, we would move v into the closure’s environment, [INFO] [stderr] 38 | | and we could no longer call drop on it in the main thread, pp. 398 */ [INFO] [stderr] | |_____________________________________________________________________________^ [INFO] [stderr] 39 | // drop(v); // oh no! [INFO] [stderr] 40 | handle.join().unwrap(); [INFO] [stderr] | ---------------------- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/6_ref_cycle_samples.rs:31:5 [INFO] [stderr] | [INFO] [stderr] 31 | /** We create an Rc instance holding a List value in the variable a with an initial list of 5, Nil. */ [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] 32 | let a: Rc = Rc::new(Cons(5,RefCell::new(Rc::new(Nil)))); [INFO] [stderr] | -------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/6_ref_cycle_samples.rs:36:5 [INFO] [stderr] | [INFO] [stderr] 36 | / /** We then create an Rc instance holding another List value in the variable b [INFO] [stderr] 37 | | that contains the value 10 and points to the list in a, pp. 381 */ [INFO] [stderr] | |__________________________________________________________________________^ [INFO] [stderr] 38 | let b: Rc = Rc::new(Cons(10,RefCell::new(Rc::clone(&a)))); [INFO] [stderr] | ---------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/6_ref_cycle_samples.rs:43:5 [INFO] [stderr] | [INFO] [stderr] 43 | / /** We modify a so it points to b instead of Nil, creating a cycle. [INFO] [stderr] 44 | | We do that by using the tail method to get a reference to the RefCell>. [INFO] [stderr] 45 | | Then we use the borrow_mut method on the RefCell> to change the value inside from an Rc [INFO] [stderr] 46 | | that holds a Nil value to the Rc in b, pp. 381 */ [INFO] [stderr] | |_______________________________________________________________^ [INFO] [stderr] 47 | / if let Some(link) = a.tail() { [INFO] [stderr] 48 | | *link.borrow_mut() = Rc::clone(&b); [INFO] [stderr] 49 | | } [INFO] [stderr] | |_____- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/bin/chap8/2_vec_immut_ref.rs:4:9 [INFO] [stderr] | [INFO] [stderr] 4 | let mut v = vec![1, 2, 3, 4, 5]; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: `rust_prog_lang` (bin "3_enum_sample") generated 5 warnings (5 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "3_generic_trait_samples" test) generated 2 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "4_reference_borrowing" test) generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "4_closure_thread_samples" test) generated 3 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "5_mut_immut_references" test) generated 3 warnings (3 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "6_ref_cycle_samples" test) generated 3 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "4_propagating_error" test) generated 3 warnings (3 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "2_vec_immut_ref" test) generated 1 warning [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/1_box_samples.rs:60:5 [INFO] [stderr] | [INFO] [stderr] 60 | / /** Compile error. [INFO] [stderr] 61 | | The error shows this type “has infnite size.” [INFO] [stderr] 62 | | The reason is that we’ve defined List with a variant that is recursive: [INFO] [stderr] 63 | | it holds another value of itself directly. [INFO] [stderr] 64 | | As a result, Rust can’t figure out how much space it needs to store a List value. */ [INFO] [stderr] | |____________________________________________________________________________________________^ [INFO] [stderr] ... [INFO] [stderr] 68 | / let list: ListBox = Cons(1, [INFO] [stderr] 69 | | Box::new(Cons(2, [INFO] [stderr] 70 | | Box::new(Cons(3, [INFO] [stderr] 71 | | Box::new(Nil)))))); [INFO] [stderr] | |___________________________________________________________________- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/1_box_samples.rs:75:5 [INFO] [stderr] | [INFO] [stderr] 75 | / /** Following the Pointer to the Value with the Dereference Operator, pp. 354 [INFO] [stderr] 76 | | The variable x holds an i32 value, 5. [INFO] [stderr] 77 | | We set y equal to a reference to x. We can assert that x is equal to 5. [INFO] [stderr] 78 | | However, if we want to make an assertion about the value in y, [INFO] [stderr] 79 | | we have to use *y to follow the reference to the value it’s pointing to (hence dereference). [INFO] [stderr] 80 | | Once we dereference y, we have access to the integer value y is pointing to [INFO] [stderr] 81 | | that we can compare with 5, pp. 355 */ [INFO] [stderr] | |______________________________________________^ [INFO] [stderr] 82 | let x = 5; [INFO] [stderr] | ---------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/1_box_samples.rs:104:5 [INFO] [stderr] | [INFO] [stderr] 104 | / /** [INFO] [stderr] 105 | | * Implicit Deref Coercions with Functions and Methods, pp. 359 */ [INFO] [stderr] | |______________________________________________________________________^ [INFO] [stderr] 106 | // call the hello function with a string slice as an argument, pp. 359 [INFO] [stderr] 107 | hello("Rust1"); [INFO] [stderr] | -------------- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/1_box_samples.rs:115:5 [INFO] [stderr] | [INFO] [stderr] 115 | / /** If Rust didn’t implement deref coercion, [INFO] [stderr] 116 | | we would have to write the code like below instead, [INFO] [stderr] 117 | | to call hello with a value of type &MyBox, pp. 359 [INFO] [stderr] 118 | | */ [INFO] [stderr] | |______^ [INFO] [stderr] 119 | let m = MyBox::new(String::from("Rust3")); [INFO] [stderr] | ------------------------------------------ rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/1_box_samples.rs:120:5 [INFO] [stderr] | [INFO] [stderr] 120 | / /** The (*m) dereferences the MyBox into a String . [INFO] [stderr] 121 | | Then the & and take a string slice of the String [INFO] [stderr] 122 | | that is equal to the whole string to match the signature of hello, pp. 360 */ [INFO] [stderr] | |_____________________________________________________________________________________^ [INFO] [stderr] 123 | hello(&(*m)[..]); [INFO] [stderr] | ---------------- rustdoc does not generate documentation for expressions [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/7_rc_weak_samples.rs:40:5 [INFO] [stderr] | [INFO] [stderr] 40 | / /** The lack of infinite output indicates that this code didn’t create a reference cycle. [INFO] [stderr] 41 | | We can also tell this by looking at the values we get from calling Rc::strong_count and Rc::weak_count */ [INFO] [stderr] | |_________________________________________________________________________________________________________________^ rustdoc does not generate documentation for macro invocations [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/7_rc_weak_samples.rs:16:5 [INFO] [stderr] | [INFO] [stderr] 16 | /** leaf starts out without a parent, so we create a new, empty Weak reference instance, pp. 386 */ [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] 17 | / let leaf = Rc::new(Node { [INFO] [stderr] 18 | | value: 3, [INFO] [stderr] 19 | | parent: RefCell::new(Weak::new()), [INFO] [stderr] 20 | | children: RefCell::new(vec![]), [INFO] [stderr] 21 | | }); [INFO] [stderr] | |_______- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/7_rc_weak_samples.rs:46:5 [INFO] [stderr] | [INFO] [stderr] 46 | /** in an inner scope and examining strong and weak reference counts, pp. 388 */ [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] 47 | / let leaf = Rc::new(Node { [INFO] [stderr] 48 | | value: 3, [INFO] [stderr] 49 | | parent: RefCell::new(Weak::new()), [INFO] [stderr] 50 | | children: RefCell::new(vec![]), [INFO] [stderr] 51 | | }); [INFO] [stderr] | |_______- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: field is never read: `value` [INFO] [stderr] --> src/bin/chap15/7_rc_weak_samples.rs:10:5 [INFO] [stderr] | [INFO] [stderr] 10 | value: i32, [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `children` [INFO] [stderr] --> src/bin/chap15/7_rc_weak_samples.rs:12:5 [INFO] [stderr] | [INFO] [stderr] 12 | children: RefCell>>, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: `rust_prog_lang` (bin "2_trait_samples" test) generated 3 warnings (3 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "1_variable_scope" test) generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust_prog_lang` (bin "2_drop_samples" test) generated 3 warnings (3 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "3_result_matching_samples" test) generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust_prog_lang` (bin "7_string_slices" test) generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust_prog_lang` (bin "4_closure_thread_samples") generated 3 warnings (3 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "1_box_samples") generated 5 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "2_result_recoverable_samples" test) generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust_prog_lang` (bin "3_generic_trait_samples") generated 2 warnings (2 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "7_rc_weak_samples" test) generated 5 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "1_box_samples" test) generated 5 warnings (5 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "7_rc_weak_samples") generated 5 warnings (5 duplicates) [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:3:13 [INFO] [stderr] | [INFO] [stderr] 3 | let mut s = String::new(); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:6:9 [INFO] [stderr] | [INFO] [stderr] 6 | let s = data.to_string(); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:11:9 [INFO] [stderr] | [INFO] [stderr] 11 | let s = "initial contents".to_string(); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:13:9 [INFO] [stderr] | [INFO] [stderr] 13 | let s = String::from("initial contents"); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `hello` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:18:9 [INFO] [stderr] | [INFO] [stderr] 18 | let hello = String::from("السلام علیكم"); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `hello` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:19:9 [INFO] [stderr] | [INFO] [stderr] 19 | let hello = String::from("Dobrý den"); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `hello` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:20:9 [INFO] [stderr] | [INFO] [stderr] 20 | let hello = String::from("Hello"); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `hello` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:21:9 [INFO] [stderr] | [INFO] [stderr] 21 | let hello = String::from("Здравствуйте"); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `hello` [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:22:9 [INFO] [stderr] | [INFO] [stderr] 22 | let hello = String::from("Hola"); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/bin/chap8/4_string_samples.rs:3:9 [INFO] [stderr] | [INFO] [stderr] 3 | let mut s = String::new(); [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `v1` [INFO] [stderr] --> src/bin/chap13/2_closure_samples.rs:64:9 [INFO] [stderr] | [INFO] [stderr] 64 | let v1 = c.value(1); let v2 = c.value(2); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_v1` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function `greater_than_100B` should have a snake case name [INFO] [stderr] --> src/bin/chap11/1_test_samples.rs:81:8 [INFO] [stderr] | [INFO] [stderr] 81 | fn greater_than_100B() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `greater_than_100_b` [INFO] [stderr] [INFO] [stderr] warning: `rust_prog_lang` (bin "4_string_samples") generated 10 warnings [INFO] [stderr] warning: `rust_prog_lang` (bin "6_mutex_samples") generated 4 warnings (4 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "4_reference_borrowing") generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust_prog_lang` (bin "4_generic_trait_samples") generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust_prog_lang` (bin "4_string_samples" test) generated 10 warnings (10 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "1_generic_samples" test) generated 2 warnings (2 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "6_ref_cycle_samples") generated 3 warnings (3 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "2_closure_samples" test) generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "1_test_samples" test) generated 4 warnings (3 duplicates) [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/bin/chap15/4_refcell_samples.rs:76:13 [INFO] [stderr] | [INFO] [stderr] 76 | / /** We can’t modify the to keep track of the messages, [INFO] [stderr] 77 | | because the send method takes an immutable reference to self, pp. 374. */ [INFO] [stderr] 78 | | // self.sent_messages.push(String::from(message)); [INFO] [stderr] 79 | | [INFO] [stderr] ... | [INFO] [stderr] 82 | | Then we can call push on the mutable reference to the vector [INFO] [stderr] 83 | | to keep track of the messages sent during the test, pp. 375 */ [INFO] [stderr] | |______________________________________________________________________________^ [INFO] [stderr] 84 | let mut one_borrow: RefMut> = self.sent_messages.borrow_mut(); [INFO] [stderr] | -------------------------------------------------------------------------- rustdoc does not generate documentation for statements [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: use `/* */` for a plain comment [INFO] [stderr] [INFO] [stderr] warning: `rust_prog_lang` (bin "4_refcell_samples" test) generated 1 warning [INFO] [stderr] warning: `rust_prog_lang` (bin "2_vec_immut_ref") generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust_prog_lang` (bin "5_channel_thread_samples" test) generated 6 warnings (6 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "1_enum_sample" test) generated 2 warnings (2 duplicates) [INFO] [stderr] warning: `rust_prog_lang` (bin "3_thread_samples") generated 1 warning (1 duplicate) [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 1.20s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/rust_prog_lang-999c3fb4ed8e57cc) [INFO] [stdout] [INFO] [stdout] running 1 test [INFO] [stdout] test front_of_house::adder::tests::internal ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_box_samples-e245d0b9c9734c0d) [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_closure_samples-17e745c990f8fe9b) [INFO] [stdout] running 0 tests [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_enum_sample-37a2c9d8dcedb565) [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_generic_samples-f3808a2be5483cc3) [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_panic_samples-a8b24df22af82e4e) [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_struct_sample-f1c84bc8a195a722) [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_test_samples-7eb25a3ec41c722d) [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 6 tests [INFO] [stdout] test tests::greeting_contains_name ... ok [INFO] [stdout] test tests::greeting_contains_name2 ... ok [INFO] [stdout] test tests::it_works ... ok [INFO] [stdout] test tests::it_adds_two ... ok [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_thread_samples-e33697af38b6624e) [INFO] [stdout] test tests::greater_than_100B - should panic ... ok [INFO] [stdout] test tests::greater_than_100 - should panic ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_variable_scope-76c6ac8529382c0d) [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/1_vec_sample-ae36c0f2d5876039) [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/2_closure_samples-1c98747b1ec53e9d) [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 1 test [INFO] [stdout] test call_with_different_values ... FAILED [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] [INFO] [stdout] ---- call_with_different_values stdout ---- [INFO] [stdout] thread 'call_with_different_values' panicked at 'assertion failed: `(left == right)` [INFO] [stdout] left: `1`, [INFO] [stdout] right: `2`', src/bin/chap13/2_closure_samples.rs:65:5 [INFO] [stdout] stack backtrace: [INFO] [stdout] 0: 0x5609213b13fc - std::backtrace_rs::backtrace::libunwind::trace::h7630ba4cba718aa0 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5 [INFO] [stdout] 1: 0x5609213b13fc - std::backtrace_rs::backtrace::trace_unsynchronized::he7498e79c157f5ac [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 [INFO] [stdout] 2: 0x5609213b13fc - std::sys_common::backtrace::_print_fmt::hdaebadaee17bca49 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/sys_common/backtrace.rs:67:5 [INFO] [stdout] 3: 0x5609213b13fc - ::fmt::h82b0e3aaf8a96140 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/sys_common/backtrace.rs:46:22 [INFO] [stdout] 4: 0x5609213d418c - core::fmt::write::h72801a82c94e6ff1 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/core/src/fmt/mod.rs:1149:17 [INFO] [stdout] 5: 0x5609213ad335 - std::io::Write::write_fmt::h21d7683cabdb4c35 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/io/mod.rs:1697:15 [INFO] [stdout] 6: 0x5609213b2e50 - std::sys_common::backtrace::_print::h1c9a1d19c48821c1 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/sys_common/backtrace.rs:49:5 [INFO] [stdout] 7: 0x5609213b2e50 - std::sys_common::backtrace::print::h7ce8802039fa9d0e [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/sys_common/backtrace.rs:36:9 [INFO] [stdout] 8: 0x5609213b2e50 - std::panicking::default_hook::{{closure}}::hb2a74a8c1499c326 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:211:50 [INFO] [stdout] 9: 0x5609213b2a36 - std::panicking::default_hook::hf4f180b00076f2b2 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:225:9 [INFO] [stdout] 10: 0x5609213b3504 - std::panicking::rust_panic_with_hook::he85ce8435493b711 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:606:17 [INFO] [stdout] 11: 0x5609213b2fe0 - std::panicking::begin_panic_handler::{{closure}}::h31e15f69e6235bd2 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:502:13 [INFO] [stdout] 12: 0x5609213b18b4 - std::sys_common::backtrace::__rust_end_short_backtrace::hfce2fadb61aaa3ae [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/sys_common/backtrace.rs:139:18 [INFO] [stdout] 13: 0x5609213b2f49 - rust_begin_unwind [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:498:5 [INFO] [stdout] 14: 0x560921359861 - core::panicking::panic_fmt::h7b8580d81fcbbacd [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/core/src/panicking.rs:107:14 [INFO] [stdout] 15: 0x5609213d2d38 - core::panicking::assert_failed_inner::hc71171cfb6f4bc69 [INFO] [stdout] 16: 0x56092135a55a - core::panicking::assert_failed::h8bc3e3a456e785aa [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/core/src/panicking.rs:145:5 [INFO] [stdout] 17: 0x56092135a250 - _2_closure_samples::call_with_different_values::hbe23c1305b402f33 [INFO] [stdout] at /opt/rustwide/workdir/src/bin/chap13/2_closure_samples.rs:65:5 [INFO] [stdout] 18: 0x56092135a18a - _2_closure_samples::call_with_different_values::{{closure}}::hbc5c5be7d39d666b [INFO] [stdout] at /opt/rustwide/workdir/src/bin/chap13/2_closure_samples.rs:62:1 [INFO] [stdout] 19: 0x56092135a78e - core::ops::function::FnOnce::call_once::hea32dd093be23282 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/core/src/ops/function.rs:227:5 [INFO] [stdout] 20: 0x56092138ee63 - core::ops::function::FnOnce::call_once::h449577f1c5b077cb [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/core/src/ops/function.rs:227:5 [INFO] [stdout] 21: 0x56092138ee63 - test::__rust_begin_short_backtrace::h8c2a0a5090591869 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/test/src/lib.rs:585:5 [INFO] [stdout] 22: 0x56092138d9f7 - as core::ops::function::FnOnce>::call_once::hea00a22128a38543 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/alloc/src/boxed.rs:1694:9 [INFO] [stdout] 23: 0x56092138d9f7 - as core::ops::function::FnOnce<()>>::call_once::he10b35c3c50d78a0 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/core/src/panic/unwind_safe.rs:271:9 [INFO] [stdout] 24: 0x56092138d9f7 - std::panicking::try::do_call::hc868e78bbc5af2ab [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:406:40 [INFO] [stdout] 25: 0x56092138d9f7 - std::panicking::try::he468aede74df1b04 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:370:19 [INFO] [stdout] 26: 0x56092138d9f7 - std::panic::catch_unwind::hce3c9152e1cf772d [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panic.rs:133:14 [INFO] [stdout] 27: 0x56092138d9f7 - test::run_test_in_process::h9c4ab8162080cf8c [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/test/src/lib.rs:608:18 [INFO] [stdout] 28: 0x56092138d9f7 - test::run_test::run_test_inner::{{closure}}::he9483433cef16afe [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/test/src/lib.rs:500:39 [INFO] [stdout] 29: 0x56092135ad3e - test::run_test::run_test_inner::{{closure}}::h479f1f872a5501ea [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/test/src/lib.rs:527:37 [INFO] [stdout] 30: 0x56092135ad3e - std::sys_common::backtrace::__rust_begin_short_backtrace::h0f1e9b1f279687bc [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/sys_common/backtrace.rs:123:18 [INFO] [stdout] 31: 0x56092135fb68 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::he5560613c5f5cb83 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/thread/mod.rs:484:17 [INFO] [stdout] 32: 0x56092135fb68 - as core::ops::function::FnOnce<()>>::call_once::h8190a68cb05ab92f [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/core/src/panic/unwind_safe.rs:271:9 [INFO] [stdout] 33: 0x56092135fb68 - std::panicking::try::do_call::h6ae22f5ac22596e4 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:406:40 [INFO] [stdout] 34: 0x56092135fb68 - std::panicking::try::h2381c25487d6a7c2 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panicking.rs:370:19 [INFO] [stdout] 35: 0x56092135fb68 - std::panic::catch_unwind::hfe902f4d5c9d7b6d [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/panic.rs:133:14 [INFO] [stdout] 36: 0x56092135fb68 - std::thread::Builder::spawn_unchecked::{{closure}}::h547fad40771a584e [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/thread/mod.rs:483:30 [INFO] [stdout] 37: 0x56092135fb68 - core::ops::function::FnOnce::call_once{{vtable.shim}}::he8602a9971738410 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/core/src/ops/function.rs:227:5 [INFO] [stdout] 38: 0x5609213b7f93 - as core::ops::function::FnOnce>::call_once::he162a5c338a10a39 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/alloc/src/boxed.rs:1694:9 [INFO] [stdout] 39: 0x5609213b7f93 - as core::ops::function::FnOnce>::call_once::hb27497b21740dd97 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/alloc/src/boxed.rs:1694:9 [INFO] [stdout] 40: 0x5609213b7f93 - std::sys::unix::thread::Thread::new::thread_start::he467e990e49c5136 [INFO] [stdout] at /rustc/a77da2d454e6caa227a85b16410b95f93495e7e0/library/std/src/sys/unix/thread.rs:106:17 [INFO] [stdout] 41: 0x7fa2287bb609 - start_thread [INFO] [stdout] 42: 0x7fa22858d293 - clone [INFO] [stdout] 43: 0x0 - [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] call_with_different_values [INFO] [stdout] [INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s [INFO] [stdout] [INFO] [stderr] error: test failed, to rerun pass '--bin 2_closure_samples' [INFO] running `Command { std: "docker" "inspect" "b96c469d8a87cc80d43d077bcba73467044b0267767fcfdaf590055b69714018", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b96c469d8a87cc80d43d077bcba73467044b0267767fcfdaf590055b69714018", kill_on_drop: false }` [INFO] [stdout] b96c469d8a87cc80d43d077bcba73467044b0267767fcfdaf590055b69714018