[INFO] cloning repository https://github.com/Rosteelton/rust-book-study [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Rosteelton/rust-book-study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRosteelton%2Frust-book-study", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRosteelton%2Frust-book-study'... 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"fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root: [INFO] [stderr] package: /workspace/builds/worker-7-tc2/source/chapters/Cargo.toml [INFO] [stderr] workspace: /workspace/builds/worker-7-tc2/source/Cargo.toml [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 415492a5ce2f7b44ba7bea3246ff5dcdddd7520fb43683b60448b379ed9ea8f3 [INFO] running `Command { std: "docker" "start" "-a" "415492a5ce2f7b44ba7bea3246ff5dcdddd7520fb43683b60448b379ed9ea8f3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "415492a5ce2f7b44ba7bea3246ff5dcdddd7520fb43683b60448b379ed9ea8f3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "415492a5ce2f7b44ba7bea3246ff5dcdddd7520fb43683b60448b379ed9ea8f3", kill_on_drop: false }` [INFO] [stdout] 415492a5ce2f7b44ba7bea3246ff5dcdddd7520fb43683b60448b379ed9ea8f3 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 3ca12cfd11eeb91f44d77ab9f8194d9e6750a3c0c75861cc8726a25d56e789eb [INFO] running `Command { std: "docker" "start" "-a" "3ca12cfd11eeb91f44d77ab9f8194d9e6750a3c0c75861cc8726a25d56e789eb", kill_on_drop: false }` [INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root: [INFO] [stderr] package: /opt/rustwide/workdir/chapters/Cargo.toml [INFO] [stderr] workspace: /opt/rustwide/workdir/Cargo.toml [INFO] [stderr] Compiling libc v0.2.155 [INFO] [stderr] Compiling zerocopy v0.8.0-alpha.6 [INFO] [stderr] Checking cfg-if v1.0.0 [INFO] [stderr] Checking ppv-lite86 v0.2.17 [INFO] [stderr] Compiling proc-macro2 v1.0.85 [INFO] [stderr] Compiling unicode-ident v1.0.12 [INFO] [stderr] Compiling autocfg v1.3.0 [INFO] [stderr] Checking futures-sink v0.3.30 [INFO] [stderr] Checking futures-core v0.3.30 [INFO] [stderr] Checking futures-task v0.3.30 [INFO] [stderr] Checking memchr v2.7.4 [INFO] [stderr] Checking futures-io v0.3.30 [INFO] [stderr] Checking pin-project-lite v0.2.14 [INFO] [stderr] Checking mini_grep v0.1.0 (/opt/rustwide/workdir/mini_grep) [INFO] [stderr] Checking oop_state_pattern v0.1.0 (/opt/rustwide/workdir/oop_state_pattern) [INFO] [stderr] Checking futures-channel v0.3.30 [INFO] [stderr] Compiling slab v0.4.9 [INFO] [stderr] Compiling quote v1.0.36 [INFO] [stderr] Compiling syn v2.0.66 [INFO] [stderr] Checking getrandom v0.2.15 [INFO] [stderr] Checking num_cpus v1.16.0 [INFO] [stderr] Checking rand_core v0.9.0-alpha.1 [INFO] [stderr] Checking rand_chacha v0.9.0-alpha.1 [INFO] [stderr] Checking rand v0.9.0-alpha.1 [INFO] [stderr] Checking chapters v0.1.0 (/opt/rustwide/workdir/chapters) [INFO] [stdout] warning: unused variable: `item1` [INFO] [stdout] --> chapters/src/bin/chapter_10_generics.rs:22:18 [INFO] [stdout] | [INFO] [stdout] 22 | pub fn some_func(item1: &impl PartialOrd) {} [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_item1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> chapters/src/bin/chapter_10_generics.rs:30:24 [INFO] [stdout] | [INFO] [stdout] 30 | 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] [INFO] [stdout] warning: unused variable: `u` [INFO] [stdout] --> chapters/src/bin/chapter_10_generics.rs:30:31 [INFO] [stdout] | [INFO] [stdout] 30 | 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 `some_function` is never used [INFO] [stdout] --> chapters/src/bin/chapter_10_generics.rs:30:4 [INFO] [stdout] | [INFO] [stdout] 30 | fn some_function(t: &T, u: &U) -> i32 [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b` [INFO] [stdout] --> chapters/src/bin/chapter_15_rc.rs:43:9 [INFO] [stdout] | [INFO] [stdout] 43 | let b = Cons(3, Rc::clone(&a)); //only increase reference counter, not a deep copy [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> chapters/src/bin/chapter_15_rc.rs:44:9 [INFO] [stdout] | [INFO] [stdout] 44 | let c = 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: fields `0` and `1` are never read [INFO] [stdout] --> chapters/src/bin/chapter_15_rc.rs:17:10 [INFO] [stdout] | [INFO] [stdout] 17 | Cons(i32, Rc), [INFO] [stdout] | ---- ^^^ ^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stdout] | [INFO] [stdout] 17 - Cons(i32, Rc), [INFO] [stdout] 17 + Cons((), ()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b` [INFO] [stdout] --> chapters/src/bin/chapter_15_rc.rs:43:9 [INFO] [stdout] | [INFO] [stdout] 43 | let b = Cons(3, Rc::clone(&a)); //only increase reference counter, not a deep copy [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> chapters/src/bin/chapter_15_rc.rs:44:9 [INFO] [stdout] | [INFO] [stdout] 44 | let c = 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: fields `0` and `1` are never read [INFO] [stdout] --> chapters/src/bin/chapter_15_rc.rs:17:10 [INFO] [stdout] | [INFO] [stdout] 17 | Cons(i32, Rc), [INFO] [stdout] | ---- ^^^ ^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `List` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields [INFO] [stdout] | [INFO] [stdout] 17 - Cons(i32, Rc), [INFO] [stdout] 17 + Cons((), ()), [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::fs` [INFO] [stdout] --> chapters/src/bin/chapter_9_error.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::fs; [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `std::fs` [INFO] [stdout] --> chapters/src/bin/chapter_9_error.rs:1:5 [INFO] [stdout] | [INFO] [stdout] 1 | use std::fs; [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> chapters/src/bin/chapter_10_1_lifetime.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | let s: &'static str = "I have a static lifetime."; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `file` [INFO] [stdout] --> chapters/src/bin/chapter_9_error.rs:8:9 [INFO] [stdout] | [INFO] [stdout] 8 | let file = File::open("text.txt").unwrap_or_else(|error| { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `read_username_from_file` is never used [INFO] [stdout] --> chapters/src/bin/chapter_9_error.rs:24:8 [INFO] [stdout] | [INFO] [stdout] 24 | fn read_username_from_file() -> Result { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:5:9 [INFO] [stdout] | [INFO] [stdout] 5 | let s2 = s1; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a2` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:34:9 [INFO] [stdout] | [INFO] [stdout] 34 | let a2 = get_ownership_2(a1); //a1 is not usable anymore [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_a2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b2` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:47:9 [INFO] [stdout] | [INFO] [stdout] 47 | let b2 = work_with_value(&b1); //BORROWING - we borrow value for the function work [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_b2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:88:9 [INFO] [stdout] | [INFO] [stdout] 88 | let s: &str = "Hello, world!"; //&str = slice for String - immutable reference [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:92:9 [INFO] [stdout] | [INFO] [stdout] 92 | let slice = &a[1..3]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: struct `Point` is never constructed [INFO] [stdout] --> chapters/src/bin/chapter_17_oop.rs:25:12 [INFO] [stdout] | [INFO] [stdout] 25 | pub struct Point { [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it [INFO] [stdout] = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: struct `Button` is never constructed [INFO] [stdout] --> chapters/src/bin/chapter_17_oop.rs:30:12 [INFO] [stdout] | [INFO] [stdout] 30 | pub struct Button { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `run_draw` is never used [INFO] [stdout] --> chapters/src/bin/chapter_17_oop.rs:18:8 [INFO] [stdout] | [INFO] [stdout] 17 | impl Screen { [INFO] [stdout] | ----------- method in this implementation [INFO] [stdout] 18 | fn run_draw(&self) { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `x` and `y` are never read [INFO] [stdout] --> chapters/src/bin/chapter_17_oop.rs:26:5 [INFO] [stdout] | [INFO] [stdout] 25 | pub struct Point { [INFO] [stdout] | ----- fields in this struct [INFO] [stdout] 26 | x: u32, [INFO] [stdout] | ^ [INFO] [stdout] 27 | y: u32, [INFO] [stdout] | ^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `place_holder` is never read [INFO] [stdout] --> chapters/src/bin/chapter_17_oop.rs:31:5 [INFO] [stdout] | [INFO] [stdout] 30 | pub struct Button { [INFO] [stdout] | ------ field in this struct [INFO] [stdout] 31 | place_holder: String, [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `chapters` (bin "chapter_17_oop") due to 2 previous errors; 3 warnings emitted [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> chapters/src/bin/chapter_10_1_lifetime.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | let s: &'static str = "I have a static lifetime."; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `file` [INFO] [stdout] --> chapters/src/bin/chapter_9_error.rs:8:9 [INFO] [stdout] | [INFO] [stdout] 8 | let file = File::open("text.txt").unwrap_or_else(|error| { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `longest_with_an_announcement` is never used [INFO] [stdout] --> chapters/src/bin/chapter_10_1_lifetime.rs:25:8 [INFO] [stdout] | [INFO] [stdout] 25 | fn longest_with_an_announcement<'a, T>( [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b1` [INFO] [stdout] --> chapters/src/bin/chapter_8_collections.rs:10:9 [INFO] [stdout] | [INFO] [stdout] 10 | let b1 = b.get(2); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_b1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b2` [INFO] [stdout] --> chapters/src/bin/chapter_8_collections.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let b2 = b[2]; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_b2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `split_at_mut` is never used [INFO] [stdout] --> chapters/src/bin/chapter_19_super_features.rs:23:8 [INFO] [stdout] | [INFO] [stdout] 23 | fn split_at_mut(values: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `associated_types` is never used [INFO] [stdout] --> chapters/src/bin/chapter_19_super_features.rs:53:4 [INFO] [stdout] | [INFO] [stdout] 53 | fn associated_types() { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `trait_ex` is never used [INFO] [stdout] --> chapters/src/bin/chapter_19_super_features.rs:66:4 [INFO] [stdout] | [INFO] [stdout] 66 | fn trait_ex() { [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: creating a shared reference to mutable static [INFO] [stdout] --> chapters/src/bin/chapter_19_super_features.rs:49:29 [INFO] [stdout] | [INFO] [stdout] 49 | println!("COUNTER: {COUNTER}"); [INFO] [stdout] | ^^^^^^^ shared reference to mutable static [INFO] [stdout] | [INFO] [stdout] = note: shared references to mutable statics are dangerous; it's undefined behavior if the static is mutated or if a mutable reference is created for it while the shared reference lives [INFO] [stdout] = note: for more information, see [INFO] [stdout] = note: `#[warn(static_mut_refs)]` (part of `#[warn(rust_2024_compatibility)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:5:9 [INFO] [stdout] | [INFO] [stdout] 5 | let s2 = s1; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a2` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:34:9 [INFO] [stdout] | [INFO] [stdout] 34 | let a2 = get_ownership_2(a1); //a1 is not usable anymore [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_a2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b2` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:47:9 [INFO] [stdout] | [INFO] [stdout] 47 | let b2 = work_with_value(&b1); //BORROWING - we borrow value for the function work [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_b2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:88:9 [INFO] [stdout] | [INFO] [stdout] 88 | let s: &str = "Hello, world!"; //&str = slice for String - immutable reference [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:92:9 [INFO] [stdout] | [INFO] [stdout] 92 | let slice = &a[1..3]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `get_ownership` is never used [INFO] [stdout] --> chapters/src/bin/chapter_4_borrowing.rs:21:8 [INFO] [stdout] | [INFO] [stdout] 21 | fn get_ownership(x: String) { [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b1` [INFO] [stdout] --> chapters/src/bin/chapter_8_collections.rs:10:9 [INFO] [stdout] | [INFO] [stdout] 10 | let b1 = b.get(2); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_b1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b2` [INFO] [stdout] --> chapters/src/bin/chapter_8_collections.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let b2 = b[2]; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_b2` [INFO] [stdout] [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "3ca12cfd11eeb91f44d77ab9f8194d9e6750a3c0c75861cc8726a25d56e789eb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3ca12cfd11eeb91f44d77ab9f8194d9e6750a3c0c75861cc8726a25d56e789eb", kill_on_drop: false }` [INFO] [stdout] 3ca12cfd11eeb91f44d77ab9f8194d9e6750a3c0c75861cc8726a25d56e789eb