[INFO] fetching crate rust-cheatsheet 0.1.0... [INFO] testing rust-cheatsheet-0.1.0 against 1.60.0 for beta-1.61-1 [INFO] extracting crate rust-cheatsheet 0.1.0 into /workspace/builds/worker-67/source [INFO] validating manifest of crates.io crate rust-cheatsheet 0.1.0 on toolchain 1.60.0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate rust-cheatsheet 0.1.0 [INFO] finished tweaking crates.io crate rust-cheatsheet 0.1.0 [INFO] tweaked toml for crates.io crate rust-cheatsheet 0.1.0 written to /workspace/builds/worker-67/source/Cargo.toml [INFO] crate crates.io crate rust-cheatsheet 0.1.0 already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 0c8d7c76eab862ef0ec70357fedaaae749382fdb64023123d6b4c9e707d457f5 [INFO] running `Command { std: "docker" "start" "-a" "0c8d7c76eab862ef0ec70357fedaaae749382fdb64023123d6b4c9e707d457f5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "0c8d7c76eab862ef0ec70357fedaaae749382fdb64023123d6b4c9e707d457f5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0c8d7c76eab862ef0ec70357fedaaae749382fdb64023123d6b4c9e707d457f5", kill_on_drop: false }` [INFO] [stdout] 0c8d7c76eab862ef0ec70357fedaaae749382fdb64023123d6b4c9e707d457f5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 269cd151d6f29231a1003c79a6cdd71b7f54853d5a790874ee04b88da6249ee1 [INFO] running `Command { std: "docker" "start" "-a" "269cd151d6f29231a1003c79a6cdd71b7f54853d5a790874ee04b88da6249ee1", kill_on_drop: false }` [INFO] [stderr] Compiling rust-cheatsheet v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `c1` [INFO] [stdout] --> src/lib.rs:87:13 [INFO] [stdout] | [INFO] [stdout] 87 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c2` [INFO] [stdout] --> src/lib.rs:87:31 [INFO] [stdout] | [INFO] [stdout] 87 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `file` [INFO] [stdout] --> src/bin/errors.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let file = match f { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:24:6 [INFO] [stdout] | [INFO] [stdout] 24 | let f = File::open("hello.txt").unwrap_or_else(|error| { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:36:6 [INFO] [stdout] | [INFO] [stdout] 36 | let f = File::open("hello.txt").unwrap(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:43:6 [INFO] [stdout] | [INFO] [stdout] 43 | let f =File::open("hello.txt").expect("error message couldn't blah blah..."); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/errors.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | Ok(s) => println!("returned string with data"), [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `k2` [INFO] [stdout] --> src/bin/collections/hashmaps.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let k2 = String::from("world"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_k2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/references.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let len = calculate_length(&s1); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/references.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/references.rs:29:6 [INFO] [stdout] | [INFO] [stdout] 29 | let r1 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/references.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let r2 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/ownership.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 14 | let y = x; // copies x to y [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: `s2` [INFO] [stdout] --> src/ownership.rs:20:7 [INFO] [stdout] | [INFO] [stdout] 20 | let s2 = s1; // s1 is considered invalid now [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_string` [INFO] [stdout] --> src/references.rs:61:11 [INFO] [stdout] | [INFO] [stdout] 61 | fn change(some_string: &String) { [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/functions.rs:13:6 [INFO] [stdout] | [INFO] [stdout] 13 | let y = 6; // is a statement. [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: variable does not need to be mutable [INFO] [stdout] --> src/references.rs:28:6 [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: `s1` [INFO] [stdout] --> src/ownership.rs:64:6 [INFO] [stdout] | [INFO] [stdout] 64 | let s1 = gives_ownership(); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/ownership.rs:66:6 [INFO] [stdout] | [INFO] [stdout] 66 | let s3 = takes_and_gives_back(s2); // takes s2 then gives it back [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> src/ownership.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let (s2, len) = calculate_length(s1); // rember s1 is moved into function [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/ownership.rs:70:11 [INFO] [stdout] | [INFO] [stdout] 70 | let (s2, len) = calculate_length(s1); // rember s1 is moved into function [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/ownership.rs:74:20 [INFO] [stdout] | [INFO] [stdout] 74 | fn take_ownership (s: String) { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/ownership.rs:78:15 [INFO] [stdout] | [INFO] [stdout] 78 | fn makes_copy(n :i32) { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/bin/errors.rs:65:2 [INFO] [stdout] | [INFO] [stdout] 65 | read_username_from_file_oneline("hello.txt"); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:5:10 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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/collections/strings.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let s = data.to_string(); // type: 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/collections/strings.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | 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/collections/strings.rs:11:6 [INFO] [stdout] | [INFO] [stdout] 11 | let hello = String::from("السلام عليكم"); [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/collections/strings.rs:12:9 [INFO] [stdout] | [INFO] [stdout] 12 | 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/collections/strings.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | 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/collections/strings.rs:14:9 [INFO] [stdout] | [INFO] [stdout] 14 | let hello = String::from("שָׁלוֹם"); [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/collections/strings.rs:15:9 [INFO] [stdout] | [INFO] [stdout] 15 | let hello = String::from("नमस्ते"); [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/collections/strings.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let hello = String::from("こんにちは"); [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/collections/strings.rs:17:9 [INFO] [stdout] | [INFO] [stdout] 17 | let hello = String::from("안녕하세요"); [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/collections/strings.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("你好"); [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/collections/strings.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Olá"); [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/collections/strings.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | 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/collections/strings.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | 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: unused variable: `s3` [INFO] [stdout] --> src/bin/collections/strings.rs:39:6 [INFO] [stdout] | [INFO] [stdout] 39 | let s3 = s1 + &s2; // NOTE: s1 has been moved here and can no longer be used [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:46:9 [INFO] [stdout] | [INFO] [stdout] 46 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/collections/strings.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | let s1 = String::from("hello"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/collections/strings.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let hello = String::from("Hola"); // len is 4 each character in UTF-8 is 1 byte [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/collections/strings.rs:54:6 [INFO] [stdout] | [INFO] [stdout] 54 | let hello = String::from("З3дравствуйте"); // len is 24 not 12 [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let s = &hello[0..4]; // type: &str (actual bytes) [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/collections/strings.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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: `v` [INFO] [stdout] --> src/bin/collections/vectors.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let v: Vec = Vec::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `does_not_exit` [INFO] [stdout] --> src/bin/collections/vectors.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let does_not_exit = v.get(100); // type: Option<&i32> // this won't [INFO] [stdout] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exit` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/collections/vectors.rs:44:6 [INFO] [stdout] | [INFO] [stdout] 44 | for i in &v { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `row` [INFO] [stdout] --> src/bin/collections/vectors.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let row = vec![ [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_row` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `median` is never read [INFO] [stdout] --> src/bin/collections/vectors.rs:103:10 [INFO] [stdout] | [INFO] [stdout] 103 | let mut median: f64 = -1.0; [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: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let slice = &s[0..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | let slice = &s[..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:9:6 [INFO] [stdout] | [INFO] [stdout] 9 | let slice = &s[3..s.len()]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:10:6 [INFO] [stdout] | [INFO] [stdout] 10 | let slice = &s[3..]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let word = first_word_better(&s[..]); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let word = first_word_better(&string_literal[..]); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:25:7 [INFO] [stdout] | [INFO] [stdout] 25 | let word = first_word_better(string_literal); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/slices.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::from("hello world"); [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: `v` [INFO] [stdout] --> src/bin/collections/vectors.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let v: Vec = Vec::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `does_not_exit` [INFO] [stdout] --> src/bin/collections/vectors.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let does_not_exit = v.get(100); // type: Option<&i32> // this won't [INFO] [stdout] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exit` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/collections/vectors.rs:44:6 [INFO] [stdout] | [INFO] [stdout] 44 | for i in &v { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `row` [INFO] [stdout] --> src/bin/collections/vectors.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let row = vec![ [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_row` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `median` is never read [INFO] [stdout] --> src/bin/collections/vectors.rs:103:10 [INFO] [stdout] | [INFO] [stdout] 103 | let mut median: f64 = -1.0; [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: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:5:10 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: 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/collections/strings.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let s = data.to_string(); // type: 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/collections/strings.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | 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/collections/strings.rs:11:6 [INFO] [stdout] | [INFO] [stdout] 11 | let hello = String::from("السلام عليكم"); [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/collections/strings.rs:12:9 [INFO] [stdout] | [INFO] [stdout] 12 | 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/collections/strings.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | 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/collections/strings.rs:14:9 [INFO] [stdout] | [INFO] [stdout] 14 | let hello = String::from("שָׁלוֹם"); [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/collections/strings.rs:15:9 [INFO] [stdout] | [INFO] [stdout] 15 | let hello = String::from("नमस्ते"); [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/collections/strings.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let hello = String::from("こんにちは"); [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/collections/strings.rs:17:9 [INFO] [stdout] | [INFO] [stdout] 17 | let hello = String::from("안녕하세요"); [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/collections/strings.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("你好"); [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/collections/strings.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Olá"); [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/collections/strings.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | 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/collections/strings.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | 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: unused variable: `s3` [INFO] [stdout] --> src/bin/collections/strings.rs:39:6 [INFO] [stdout] | [INFO] [stdout] 39 | let s3 = s1 + &s2; // NOTE: s1 has been moved here and can no longer be used [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:46:9 [INFO] [stdout] | [INFO] [stdout] 46 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/collections/strings.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | let s1 = String::from("hello"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/collections/strings.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let hello = String::from("Hola"); // len is 4 each character in UTF-8 is 1 byte [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/collections/strings.rs:54:6 [INFO] [stdout] | [INFO] [stdout] 54 | let hello = String::from("З3дравствуйте"); // len is 24 not 12 [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let s = &hello[0..4]; // type: &str (actual bytes) [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `k2` [INFO] [stdout] --> src/bin/collections/hashmaps.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let k2 = String::from("world"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_k2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/collections/strings.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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: `v` [INFO] [stdout] --> src/enums/enums2.rs:19:6 [INFO] [stdout] | [INFO] [stdout] 19 | let v = value_in_cents(c); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six` [INFO] [stdout] --> src/enums/enums2.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let six = plus_one(five); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `none` [INFO] [stdout] --> src/enums/enums2.rs:28:6 [INFO] [stdout] | [INFO] [stdout] 28 | let none = plus_one(None); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `count` is assigned to, but never used [INFO] [stdout] --> src/enums/enums2.rs:54:10 [INFO] [stdout] | [INFO] [stdout] 54 | let mut count = 0; [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_count` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `count` is never read [INFO] [stdout] --> src/enums/enums2.rs:59:3 [INFO] [stdout] | [INFO] [stdout] 59 | count += 1; [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: variant is never constructed: `Penny` [INFO] [stdout] --> src/enums/enums2.rs:4:2 [INFO] [stdout] | [INFO] [stdout] 4 | Penny, [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant is never constructed: `Nickel` [INFO] [stdout] --> src/enums/enums2.rs:5:2 [INFO] [stdout] | [INFO] [stdout] 5 | Nickel, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/generics/main.rs:79:56 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [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/generics/main.rs:79:63 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/generics/main.rs:81:31 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(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] --> src/bin/generics/main.rs:81:38 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(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 variable: `integer` [INFO] [stdout] --> src/bin/generics/main.rs:170:6 [INFO] [stdout] | [INFO] [stdout] 170 | let integer =Point {x: 32, y: 23}; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `intfloat` [INFO] [stdout] --> src/bin/generics/main.rs:173:6 [INFO] [stdout] | [INFO] [stdout] 173 | let intfloat = Point2 {x: 3.2, y: 32}; [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intfloat` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `new_tweet` [INFO] [stdout] --> src/bin/generics/main.rs:212:6 [INFO] [stdout] | [INFO] [stdout] 212 | let new_tweet = return_summarizable(); [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_tweet` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `rect1` [INFO] [stdout] --> src/structs/structs2.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let rect1 = Rectangle { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user3` [INFO] [stdout] --> src/structs/structs1.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let user3 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `black` [INFO] [stdout] --> src/structs/structs1.rs:26:6 [INFO] [stdout] | [INFO] [stdout] 26 | let black = Color(0, 0, 0); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_black` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `oirigin` [INFO] [stdout] --> src/structs/structs1.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let oirigin = Point(0, 0, 0); [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_oirigin` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `width` [INFO] [stdout] --> src/structs/structs2.rs:4:2 [INFO] [stdout] | [INFO] [stdout] 4 | width: u32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `username` [INFO] [stdout] --> src/structs/structs1.rs:52:2 [INFO] [stdout] | [INFO] [stdout] 52 | username: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `sign_in_count` [INFO] [stdout] --> src/structs/structs1.rs:54:2 [INFO] [stdout] | [INFO] [stdout] 54 | sign_in_count: u64, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `height` [INFO] [stdout] --> src/structs/structs2.rs:5:2 [INFO] [stdout] | [INFO] [stdout] 5 | height: u32, [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `active` [INFO] [stdout] --> src/structs/structs1.rs:55:2 [INFO] [stdout] | [INFO] [stdout] 55 | active: bool, [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `width` [INFO] [stdout] --> src/structs/structs2.rs:10:2 [INFO] [stdout] | [INFO] [stdout] 10 | width: u32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `RectangleDebug` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/structs/structs2.rs:8:10 [INFO] [stdout] | [INFO] [stdout] 8 | #[derive(Debug)] // opt into including debugging information on this struct [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/generics/main.rs:7:2 [INFO] [stdout] | [INFO] [stdout] 7 | y: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `height` [INFO] [stdout] --> src/structs/structs2.rs:11:2 [INFO] [stdout] | [INFO] [stdout] 11 | height: u32 [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `RectangleDebug` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/structs/structs2.rs:8:10 [INFO] [stdout] | [INFO] [stdout] 8 | #[derive(Debug)] // opt into including debugging information on this struct [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `x` [INFO] [stdout] --> src/bin/generics/main.rs:11:5 [INFO] [stdout] | [INFO] [stdout] 11 | x: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/generics/main.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 12 | y: U, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum is never used: `Option` [INFO] [stdout] --> src/bin/generics/main.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | enum Option { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum is never used: `Result` [INFO] [stdout] --> src/bin/generics/main.rs:20:6 [INFO] [stdout] | [INFO] [stdout] 20 | enum Result { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `distance_from_origin` [INFO] [stdout] --> src/bin/generics/main.rs:32:5 [INFO] [stdout] | [INFO] [stdout] 32 | fn distance_from_origin(&self) -> f32 { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `mixup` [INFO] [stdout] --> src/bin/generics/main.rs:38:5 [INFO] [stdout] | [INFO] [stdout] 38 | fn mixup(self, other: Point2) -> Point2 { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `notify_mult_impl` [INFO] [stdout] --> src/bin/generics/main.rs:70:4 [INFO] [stdout] | [INFO] [stdout] 70 | fn notify_mult_impl(item: &T) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function` [INFO] [stdout] --> src/bin/generics/main.rs:79:4 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function_where_` [INFO] [stdout] --> src/bin/generics/main.rs:81:4 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(t: &T, u: &U) -> i32 [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_clone` [INFO] [stdout] --> src/bin/generics/main.rs:107:4 [INFO] [stdout] | [INFO] [stdout] 107 | fn largest_clone(list: &[T]) -> T { [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_using_return_ref` [INFO] [stdout] --> src/bin/generics/main.rs:118:4 [INFO] [stdout] | [INFO] [stdout] 118 | fn largest_using_return_ref(list: &[T]) -> &T { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct is never constructed: `Pair` [INFO] [stdout] --> src/bin/generics/main.rs:130:8 [INFO] [stdout] | [INFO] [stdout] 130 | struct Pair { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/bin/generics/main.rs:136:5 [INFO] [stdout] | [INFO] [stdout] 136 | fn new(x: T, y: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `cmp_display` [INFO] [stdout] --> src/bin/generics/main.rs:142:5 [INFO] [stdout] | [INFO] [stdout] 142 | fn cmp_display(&self) { // fn is only implement when generic type of T conform to PartialOrd and Display trait [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait method `summarizeDef` should have a snake case name [INFO] [stdout] --> src/bin/generics/traits.rs:14:5 [INFO] [stdout] | [INFO] [stdout] 14 | fn summarizeDef(&self) -> String { [INFO] [stdout] | ^^^^^^^^^^^^ help: convert the identifier to snake case: `summarize_def` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `contents` [INFO] [stdout] --> src/main.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let contents = format!("{}\t{}\n", key, value); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_contents` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/bin/iterators.rs:93:6 [INFO] [stdout] | [INFO] [stdout] 93 | let x: Vec<_> = v1.iter().map(|x| x + 1).collect(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `shoes_in_size` [INFO] [stdout] --> src/bin/iterators.rs:10:4 [INFO] [stdout] | [INFO] [stdout] 10 | fn shoes_in_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: unused variable: `spaces` [INFO] [stdout] --> src/variables.rs:28:6 [INFO] [stdout] | [INFO] [stdout] 28 | let spaces = spaces.len(); // type: usize [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `spaces_mut` [INFO] [stdout] --> src/variables.rs:30:10 [INFO] [stdout] | [INFO] [stdout] 30 | let mut spaces_mut = " "; // type: &str [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces_mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/variables.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let mut spaces_mut = " "; // type: &str [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: `add_two` [INFO] [stdout] --> src/bin/testing.rs:6:4 [INFO] [stdout] | [INFO] [stdout] 6 | fn add_two(a: i32) -> 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: `width` [INFO] [stdout] --> src/bin/testing.rs:100:5 [INFO] [stdout] | [INFO] [stdout] 100 | width: u32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/bin/testing.rs:98:10 [INFO] [stdout] | [INFO] [stdout] 98 | #[derive(Debug)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `height` [INFO] [stdout] --> src/bin/testing.rs:101:5 [INFO] [stdout] | [INFO] [stdout] 101 | height: u32, [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/bin/testing.rs:98:10 [INFO] [stdout] | [INFO] [stdout] 98 | #[derive(Debug)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `guess` [INFO] [stdout] --> src/data-types.rs:9:6 [INFO] [stdout] | [INFO] [stdout] 9 | let guess: u32 = "43".parse().expect("this is not a number"); // works: [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let x: i8; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:13:6 [INFO] [stdout] | [INFO] [stdout] 13 | let x: u8; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 14 | let x: i16; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let x: u16; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:16:6 [INFO] [stdout] | [INFO] [stdout] 16 | let x: i32; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:17:6 [INFO] [stdout] | [INFO] [stdout] 17 | let x: u32; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let x: i64; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:19:6 [INFO] [stdout] | [INFO] [stdout] 19 | let x: u64; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:20:6 [INFO] [stdout] | [INFO] [stdout] 20 | let x: i128; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:21:6 [INFO] [stdout] | [INFO] [stdout] 21 | let x: u128; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:22:6 [INFO] [stdout] | [INFO] [stdout] 22 | let x: isize; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:23:6 [INFO] [stdout] | [INFO] [stdout] 23 | let x: usize; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:26:6 [INFO] [stdout] | [INFO] [stdout] 26 | let x = 2.0; // defaults to f64 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/data-types.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let y: f32 = 3.0; // f32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/data-types.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let t = true; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/data-types.rs:31:6 [INFO] [stdout] | [INFO] [stdout] 31 | let f: bool = false; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/data-types.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let c = 'z'; // char [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/data-types.rs:37:6 [INFO] [stdout] | [INFO] [stdout] 37 | let z = 'ℤ'; // char [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `heart_eyed_cat` [INFO] [stdout] --> src/data-types.rs:38:6 [INFO] [stdout] | [INFO] [stdout] 38 | let heart_eyed_cat = '😻'; // char [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:45:7 [INFO] [stdout] | [INFO] [stdout] 45 | let (x, y, z) = tup; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/data-types.rs:45:13 [INFO] [stdout] | [INFO] [stdout] 45 | let (x, y, z) = tup; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `five_hundred` [INFO] [stdout] --> src/data-types.rs:48:6 [INFO] [stdout] | [INFO] [stdout] 48 | let five_hundred = tup.0; [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_five_hundred` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six_point_four` [INFO] [stdout] --> src/data-types.rs:49:9 [INFO] [stdout] | [INFO] [stdout] 49 | let six_point_four =tup.1; [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_six_point_four` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `one` [INFO] [stdout] --> src/data-types.rs:50:9 [INFO] [stdout] | [INFO] [stdout] 50 | let one = tup.2; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_one` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/data-types.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let a = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/data-types.rs:55:6 [INFO] [stdout] | [INFO] [stdout] 55 | let a: [i32; 5] = [1,2,3,4,5]; // an array of 5 i32's [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `fisrt` [INFO] [stdout] --> src/data-types.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let fisrt =a[0]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_fisrt` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 21 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 7 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 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: 28 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: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 23 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 27 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 3.72s [INFO] running `Command { std: "docker" "inspect" "269cd151d6f29231a1003c79a6cdd71b7f54853d5a790874ee04b88da6249ee1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "269cd151d6f29231a1003c79a6cdd71b7f54853d5a790874ee04b88da6249ee1", kill_on_drop: false }` [INFO] [stdout] 269cd151d6f29231a1003c79a6cdd71b7f54853d5a790874ee04b88da6249ee1 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] c1203f0c61f606d0879fae2b329943278d187424f4c2c6b93af843d7843493e9 [INFO] running `Command { std: "docker" "start" "-a" "c1203f0c61f606d0879fae2b329943278d187424f4c2c6b93af843d7843493e9", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stdout] warning: unused variable: `c1` [INFO] [stdout] --> src/lib.rs:87:13 [INFO] [stdout] | [INFO] [stdout] 87 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Compiling rust-cheatsheet v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `c2` [INFO] [stdout] --> src/lib.rs:87:31 [INFO] [stdout] | [INFO] [stdout] 87 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/collections/vectors.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let v: Vec = Vec::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `does_not_exit` [INFO] [stdout] --> src/bin/collections/vectors.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let does_not_exit = v.get(100); // type: Option<&i32> // this won't [INFO] [stdout] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exit` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/collections/vectors.rs:44:6 [INFO] [stdout] | [INFO] [stdout] 44 | for i in &v { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `row` [INFO] [stdout] --> src/bin/collections/vectors.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let row = vec![ [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_row` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `median` is never read [INFO] [stdout] --> src/bin/collections/vectors.rs:103:10 [INFO] [stdout] | [INFO] [stdout] 103 | let mut median: f64 = -1.0; [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: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user3` [INFO] [stdout] --> src/structs/structs1.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let user3 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `black` [INFO] [stdout] --> src/structs/structs1.rs:26:6 [INFO] [stdout] | [INFO] [stdout] 26 | let black = Color(0, 0, 0); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_black` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `oirigin` [INFO] [stdout] --> src/structs/structs1.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let oirigin = Point(0, 0, 0); [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_oirigin` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `username` [INFO] [stdout] --> src/structs/structs1.rs:52:2 [INFO] [stdout] | [INFO] [stdout] 52 | username: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `sign_in_count` [INFO] [stdout] --> src/structs/structs1.rs:54:2 [INFO] [stdout] | [INFO] [stdout] 54 | sign_in_count: u64, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `active` [INFO] [stdout] --> src/structs/structs1.rs:55:2 [INFO] [stdout] | [INFO] [stdout] 55 | active: bool, [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/ownership.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 14 | let y = x; // copies x to y [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: `s2` [INFO] [stdout] --> src/ownership.rs:20:7 [INFO] [stdout] | [INFO] [stdout] 20 | let s2 = s1; // s1 is considered invalid now [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/ownership.rs:64:6 [INFO] [stdout] | [INFO] [stdout] 64 | let s1 = gives_ownership(); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/ownership.rs:66:6 [INFO] [stdout] | [INFO] [stdout] 66 | let s3 = takes_and_gives_back(s2); // takes s2 then gives it back [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> src/ownership.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let (s2, len) = calculate_length(s1); // rember s1 is moved into function [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/ownership.rs:70:11 [INFO] [stdout] | [INFO] [stdout] 70 | let (s2, len) = calculate_length(s1); // rember s1 is moved into function [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/ownership.rs:74:20 [INFO] [stdout] | [INFO] [stdout] 74 | fn take_ownership (s: String) { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/ownership.rs:78:15 [INFO] [stdout] | [INFO] [stdout] 78 | fn makes_copy(n :i32) { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `add_two` [INFO] [stdout] --> src/bin/testing.rs:6:4 [INFO] [stdout] | [INFO] [stdout] 6 | fn add_two(a: i32) -> 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: `width` [INFO] [stdout] --> src/bin/testing.rs:100:5 [INFO] [stdout] | [INFO] [stdout] 100 | width: u32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/bin/testing.rs:98:10 [INFO] [stdout] | [INFO] [stdout] 98 | #[derive(Debug)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `height` [INFO] [stdout] --> src/bin/testing.rs:101:5 [INFO] [stdout] | [INFO] [stdout] 101 | height: u32, [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/bin/testing.rs:98:10 [INFO] [stdout] | [INFO] [stdout] 98 | #[derive(Debug)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `rect1` [INFO] [stdout] --> src/structs/structs2.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let rect1 = Rectangle { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `width` [INFO] [stdout] --> src/structs/structs2.rs:4:2 [INFO] [stdout] | [INFO] [stdout] 4 | width: u32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `height` [INFO] [stdout] --> src/structs/structs2.rs:5:2 [INFO] [stdout] | [INFO] [stdout] 5 | height: u32, [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `width` [INFO] [stdout] --> src/structs/structs2.rs:10:2 [INFO] [stdout] | [INFO] [stdout] 10 | width: u32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `RectangleDebug` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/structs/structs2.rs:8:10 [INFO] [stdout] | [INFO] [stdout] 8 | #[derive(Debug)] // opt into including debugging information on this struct [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `height` [INFO] [stdout] --> src/structs/structs2.rs:11:2 [INFO] [stdout] | [INFO] [stdout] 11 | height: u32 [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `RectangleDebug` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/structs/structs2.rs:8:10 [INFO] [stdout] | [INFO] [stdout] 8 | #[derive(Debug)] // opt into including debugging information on this struct [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:5:10 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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/collections/strings.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let s = data.to_string(); // type: 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/collections/strings.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | 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/collections/strings.rs:11:6 [INFO] [stdout] | [INFO] [stdout] 11 | let hello = String::from("السلام عليكم"); [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/collections/strings.rs:12:9 [INFO] [stdout] | [INFO] [stdout] 12 | 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/collections/strings.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | 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/collections/strings.rs:14:9 [INFO] [stdout] | [INFO] [stdout] 14 | let hello = String::from("שָׁלוֹם"); [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/collections/strings.rs:15:9 [INFO] [stdout] | [INFO] [stdout] 15 | let hello = String::from("नमस्ते"); [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/collections/strings.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let hello = String::from("こんにちは"); [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/collections/strings.rs:17:9 [INFO] [stdout] | [INFO] [stdout] 17 | let hello = String::from("안녕하세요"); [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/collections/strings.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("你好"); [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/collections/strings.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Olá"); [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/collections/strings.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | 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/collections/strings.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | 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: unused variable: `s3` [INFO] [stdout] --> src/bin/collections/strings.rs:39:6 [INFO] [stdout] | [INFO] [stdout] 39 | let s3 = s1 + &s2; // NOTE: s1 has been moved here and can no longer be used [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:46:9 [INFO] [stdout] | [INFO] [stdout] 46 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/collections/strings.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | let s1 = String::from("hello"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/collections/strings.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let hello = String::from("Hola"); // len is 4 each character in UTF-8 is 1 byte [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/collections/strings.rs:54:6 [INFO] [stdout] | [INFO] [stdout] 54 | let hello = String::from("З3дравствуйте"); // len is 24 not 12 [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let s = &hello[0..4]; // type: &str (actual bytes) [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/collections/strings.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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: 21 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/references.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let len = calculate_length(&s1); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/references.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/references.rs:29:6 [INFO] [stdout] | [INFO] [stdout] 29 | let r1 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/references.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let r2 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_string` [INFO] [stdout] --> src/references.rs:61:11 [INFO] [stdout] | [INFO] [stdout] 61 | fn change(some_string: &String) { [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/references.rs:28:6 [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: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/collections/vectors.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let v: Vec = Vec::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `does_not_exit` [INFO] [stdout] --> src/bin/collections/vectors.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let does_not_exit = v.get(100); // type: Option<&i32> // this won't [INFO] [stdout] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exit` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/collections/vectors.rs:44:6 [INFO] [stdout] | [INFO] [stdout] 44 | for i in &v { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `row` [INFO] [stdout] --> src/bin/collections/vectors.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let row = vec![ [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_row` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `median` is never read [INFO] [stdout] --> src/bin/collections/vectors.rs:103:10 [INFO] [stdout] | [INFO] [stdout] 103 | let mut median: f64 = -1.0; [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: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:5:10 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: 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/collections/strings.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let s = data.to_string(); // type: 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/collections/strings.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | 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/collections/strings.rs:11:6 [INFO] [stdout] | [INFO] [stdout] 11 | let hello = String::from("السلام عليكم"); [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/collections/strings.rs:12:9 [INFO] [stdout] | [INFO] [stdout] 12 | 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/collections/strings.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | 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/collections/strings.rs:14:9 [INFO] [stdout] | [INFO] [stdout] 14 | let hello = String::from("שָׁלוֹם"); [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/collections/strings.rs:15:9 [INFO] [stdout] | [INFO] [stdout] 15 | let hello = String::from("नमस्ते"); [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/collections/strings.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let hello = String::from("こんにちは"); [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/collections/strings.rs:17:9 [INFO] [stdout] | [INFO] [stdout] 17 | let hello = String::from("안녕하세요"); [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/collections/strings.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("你好"); [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/collections/strings.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Olá"); [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/collections/strings.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | 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/collections/strings.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | 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: unused variable: `s3` [INFO] [stdout] --> src/bin/collections/strings.rs:39:6 [INFO] [stdout] | [INFO] [stdout] 39 | let s3 = s1 + &s2; // NOTE: s1 has been moved here and can no longer be used [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:46:9 [INFO] [stdout] | [INFO] [stdout] 46 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/collections/strings.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | let s1 = String::from("hello"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/collections/strings.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let hello = String::from("Hola"); // len is 4 each character in UTF-8 is 1 byte [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/collections/strings.rs:54:6 [INFO] [stdout] | [INFO] [stdout] 54 | let hello = String::from("З3дравствуйте"); // len is 24 not 12 [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let s = &hello[0..4]; // type: &str (actual bytes) [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `k2` [INFO] [stdout] --> src/bin/collections/hashmaps.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let k2 = String::from("world"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_k2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/collections/strings.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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: 27 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `k2` [INFO] [stdout] --> src/bin/collections/hashmaps.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let k2 = String::from("world"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_k2` [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: `spaces` [INFO] [stdout] --> src/variables.rs:28:6 [INFO] [stdout] | [INFO] [stdout] 28 | let spaces = spaces.len(); // type: usize [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `spaces_mut` [INFO] [stdout] --> src/variables.rs:30:10 [INFO] [stdout] | [INFO] [stdout] 30 | let mut spaces_mut = " "; // type: &str [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces_mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/variables.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let mut spaces_mut = " "; // type: &str [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: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let slice = &s[0..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | let slice = &s[..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:9:6 [INFO] [stdout] | [INFO] [stdout] 9 | let slice = &s[3..s.len()]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:10:6 [INFO] [stdout] | [INFO] [stdout] 10 | let slice = &s[3..]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let word = first_word_better(&s[..]); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let word = first_word_better(&string_literal[..]); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:25:7 [INFO] [stdout] | [INFO] [stdout] 25 | let word = first_word_better(string_literal); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/slices.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::from("hello world"); [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: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/bin/iterators.rs:93:6 [INFO] [stdout] | [INFO] [stdout] 93 | let x: Vec<_> = v1.iter().map(|x| x + 1).collect(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `shoes_in_size` [INFO] [stdout] --> src/bin/iterators.rs:10:4 [INFO] [stdout] | [INFO] [stdout] 10 | fn shoes_in_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: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/functions.rs:13:6 [INFO] [stdout] | [INFO] [stdout] 13 | let y = 6; // is a statement. [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: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `file` [INFO] [stdout] --> src/bin/errors.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let file = match f { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:24:6 [INFO] [stdout] | [INFO] [stdout] 24 | let f = File::open("hello.txt").unwrap_or_else(|error| { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:36:6 [INFO] [stdout] | [INFO] [stdout] 36 | let f = File::open("hello.txt").unwrap(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:43:6 [INFO] [stdout] | [INFO] [stdout] 43 | let f =File::open("hello.txt").expect("error message couldn't blah blah..."); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/errors.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | Ok(s) => println!("returned string with data"), [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/bin/errors.rs:65:2 [INFO] [stdout] | [INFO] [stdout] 65 | read_username_from_file_oneline("hello.txt"); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/generics/main.rs:79:56 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [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/generics/main.rs:79:63 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/generics/main.rs:81:31 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(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] --> src/bin/generics/main.rs:81:38 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(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 variable: `integer` [INFO] [stdout] --> src/bin/generics/main.rs:170:6 [INFO] [stdout] | [INFO] [stdout] 170 | let integer =Point {x: 32, y: 23}; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `intfloat` [INFO] [stdout] --> src/bin/generics/main.rs:173:6 [INFO] [stdout] | [INFO] [stdout] 173 | let intfloat = Point2 {x: 3.2, y: 32}; [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intfloat` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `new_tweet` [INFO] [stdout] --> src/bin/generics/main.rs:212:6 [INFO] [stdout] | [INFO] [stdout] 212 | let new_tweet = return_summarizable(); [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_tweet` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/generics/main.rs:7:2 [INFO] [stdout] | [INFO] [stdout] 7 | y: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `x` [INFO] [stdout] --> src/bin/generics/main.rs:11:5 [INFO] [stdout] | [INFO] [stdout] 11 | x: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/generics/main.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 12 | y: U, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum is never used: `Option` [INFO] [stdout] --> src/bin/generics/main.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | enum Option { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum is never used: `Result` [INFO] [stdout] --> src/bin/generics/main.rs:20:6 [INFO] [stdout] | [INFO] [stdout] 20 | enum Result { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `distance_from_origin` [INFO] [stdout] --> src/bin/generics/main.rs:32:5 [INFO] [stdout] | [INFO] [stdout] 32 | fn distance_from_origin(&self) -> f32 { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `mixup` [INFO] [stdout] --> src/bin/generics/main.rs:38:5 [INFO] [stdout] | [INFO] [stdout] 38 | fn mixup(self, other: Point2) -> Point2 { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `notify_mult_impl` [INFO] [stdout] --> src/bin/generics/main.rs:70:4 [INFO] [stdout] | [INFO] [stdout] 70 | fn notify_mult_impl(item: &T) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function` [INFO] [stdout] --> src/bin/generics/main.rs:79:4 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function_where_` [INFO] [stdout] --> src/bin/generics/main.rs:81:4 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(t: &T, u: &U) -> i32 [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_clone` [INFO] [stdout] --> src/bin/generics/main.rs:107:4 [INFO] [stdout] | [INFO] [stdout] 107 | fn largest_clone(list: &[T]) -> T { [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_using_return_ref` [INFO] [stdout] --> src/bin/generics/main.rs:118:4 [INFO] [stdout] | [INFO] [stdout] 118 | fn largest_using_return_ref(list: &[T]) -> &T { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct is never constructed: `Pair` [INFO] [stdout] --> src/bin/generics/main.rs:130:8 [INFO] [stdout] | [INFO] [stdout] 130 | struct Pair { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/bin/generics/main.rs:136:5 [INFO] [stdout] | [INFO] [stdout] 136 | fn new(x: T, y: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `cmp_display` [INFO] [stdout] --> src/bin/generics/main.rs:142:5 [INFO] [stdout] | [INFO] [stdout] 142 | fn cmp_display(&self) { // fn is only implement when generic type of T conform to PartialOrd and Display trait [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait method `summarizeDef` should have a snake case name [INFO] [stdout] --> src/bin/generics/traits.rs:14:5 [INFO] [stdout] | [INFO] [stdout] 14 | fn summarizeDef(&self) -> String { [INFO] [stdout] | ^^^^^^^^^^^^ help: convert the identifier to snake case: `summarize_def` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 23 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/enums/enums2.rs:19:6 [INFO] [stdout] | [INFO] [stdout] 19 | let v = value_in_cents(c); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six` [INFO] [stdout] --> src/enums/enums2.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let six = plus_one(five); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `none` [INFO] [stdout] --> src/enums/enums2.rs:28:6 [INFO] [stdout] | [INFO] [stdout] 28 | let none = plus_one(None); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `count` is assigned to, but never used [INFO] [stdout] --> src/enums/enums2.rs:54:10 [INFO] [stdout] | [INFO] [stdout] 54 | let mut count = 0; [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_count` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `count` is never read [INFO] [stdout] --> src/enums/enums2.rs:59:3 [INFO] [stdout] | [INFO] [stdout] 59 | count += 1; [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: variant is never constructed: `Penny` [INFO] [stdout] --> src/enums/enums2.rs:4:2 [INFO] [stdout] | [INFO] [stdout] 4 | Penny, [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant is never constructed: `Nickel` [INFO] [stdout] --> src/enums/enums2.rs:5:2 [INFO] [stdout] | [INFO] [stdout] 5 | Nickel, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 7 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `guess` [INFO] [stdout] --> src/data-types.rs:9:6 [INFO] [stdout] | [INFO] [stdout] 9 | let guess: u32 = "43".parse().expect("this is not a number"); // works: [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let x: i8; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:13:6 [INFO] [stdout] | [INFO] [stdout] 13 | let x: u8; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 14 | let x: i16; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let x: u16; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:16:6 [INFO] [stdout] | [INFO] [stdout] 16 | let x: i32; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:17:6 [INFO] [stdout] | [INFO] [stdout] 17 | let x: u32; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let x: i64; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:19:6 [INFO] [stdout] | [INFO] [stdout] 19 | let x: u64; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:20:6 [INFO] [stdout] | [INFO] [stdout] 20 | let x: i128; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:21:6 [INFO] [stdout] | [INFO] [stdout] 21 | let x: u128; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:22:6 [INFO] [stdout] | [INFO] [stdout] 22 | let x: isize; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:23:6 [INFO] [stdout] | [INFO] [stdout] 23 | let x: usize; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:26:6 [INFO] [stdout] | [INFO] [stdout] 26 | let x = 2.0; // defaults to f64 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/data-types.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let y: f32 = 3.0; // f32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/data-types.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let t = true; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/data-types.rs:31:6 [INFO] [stdout] | [INFO] [stdout] 31 | let f: bool = false; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/data-types.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let c = 'z'; // char [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/data-types.rs:37:6 [INFO] [stdout] | [INFO] [stdout] 37 | let z = 'ℤ'; // char [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `heart_eyed_cat` [INFO] [stdout] --> src/data-types.rs:38:6 [INFO] [stdout] | [INFO] [stdout] 38 | let heart_eyed_cat = '😻'; // char [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:45:7 [INFO] [stdout] | [INFO] [stdout] 45 | let (x, y, z) = tup; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/data-types.rs:45:13 [INFO] [stdout] | [INFO] [stdout] 45 | let (x, y, z) = tup; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `five_hundred` [INFO] [stdout] --> src/data-types.rs:48:6 [INFO] [stdout] | [INFO] [stdout] 48 | let five_hundred = tup.0; [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_five_hundred` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six_point_four` [INFO] [stdout] --> src/data-types.rs:49:9 [INFO] [stdout] | [INFO] [stdout] 49 | let six_point_four =tup.1; [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_six_point_four` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `one` [INFO] [stdout] --> src/data-types.rs:50:9 [INFO] [stdout] | [INFO] [stdout] 50 | let one = tup.2; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_one` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/data-types.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let a = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/data-types.rs:55:6 [INFO] [stdout] | [INFO] [stdout] 55 | let a: [i32; 5] = [1,2,3,4,5]; // an array of 5 i32's [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `fisrt` [INFO] [stdout] --> src/data-types.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let fisrt =a[0]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_fisrt` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 28 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `contents` [INFO] [stdout] --> src/main.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let contents = format!("{}\t{}\n", key, value); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_contents` [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: `spaces` [INFO] [stdout] --> src/variables.rs:28:6 [INFO] [stdout] | [INFO] [stdout] 28 | let spaces = spaces.len(); // type: usize [INFO] [stdout] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `spaces_mut` [INFO] [stdout] --> src/variables.rs:30:10 [INFO] [stdout] | [INFO] [stdout] 30 | let mut spaces_mut = " "; // type: &str [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces_mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/variables.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let mut spaces_mut = " "; // type: &str [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: `y` [INFO] [stdout] --> src/functions.rs:13:6 [INFO] [stdout] | [INFO] [stdout] 13 | let y = 6; // is a statement. [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: `file` [INFO] [stdout] --> src/bin/errors.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let file = match f { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:24:6 [INFO] [stdout] | [INFO] [stdout] 24 | let f = File::open("hello.txt").unwrap_or_else(|error| { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:36:6 [INFO] [stdout] | [INFO] [stdout] 36 | let f = File::open("hello.txt").unwrap(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/bin/errors.rs:43:6 [INFO] [stdout] | [INFO] [stdout] 43 | let f =File::open("hello.txt").expect("error message couldn't blah blah..."); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/errors.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | Ok(s) => println!("returned string with data"), [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/bin/errors.rs:65:2 [INFO] [stdout] | [INFO] [stdout] 65 | read_username_from_file_oneline("hello.txt"); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/ownership.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 14 | let y = x; // copies x to y [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: `s2` [INFO] [stdout] --> src/ownership.rs:20:7 [INFO] [stdout] | [INFO] [stdout] 20 | let s2 = s1; // s1 is considered invalid now [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/ownership.rs:64:6 [INFO] [stdout] | [INFO] [stdout] 64 | let s1 = gives_ownership(); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/ownership.rs:66:6 [INFO] [stdout] | [INFO] [stdout] 66 | let s3 = takes_and_gives_back(s2); // takes s2 then gives it back [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> src/ownership.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let (s2, len) = calculate_length(s1); // rember s1 is moved into function [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/ownership.rs:70:11 [INFO] [stdout] | [INFO] [stdout] 70 | let (s2, len) = calculate_length(s1); // rember s1 is moved into function [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/ownership.rs:74:20 [INFO] [stdout] | [INFO] [stdout] 74 | fn take_ownership (s: String) { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/ownership.rs:78:15 [INFO] [stdout] | [INFO] [stdout] 78 | fn makes_copy(n :i32) { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user3` [INFO] [stdout] --> src/structs/structs1.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let user3 = User { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `black` [INFO] [stdout] --> src/structs/structs1.rs:26:6 [INFO] [stdout] | [INFO] [stdout] 26 | let black = Color(0, 0, 0); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_black` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `oirigin` [INFO] [stdout] --> src/structs/structs1.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let oirigin = Point(0, 0, 0); [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_oirigin` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `username` [INFO] [stdout] --> src/structs/structs1.rs:52:2 [INFO] [stdout] | [INFO] [stdout] 52 | username: String, [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `sign_in_count` [INFO] [stdout] --> src/structs/structs1.rs:54:2 [INFO] [stdout] | [INFO] [stdout] 54 | sign_in_count: u64, [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `active` [INFO] [stdout] --> src/structs/structs1.rs:55:2 [INFO] [stdout] | [INFO] [stdout] 55 | active: bool, [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `len` [INFO] [stdout] --> src/references.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let len = calculate_length(&s1); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/references.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/references.rs:29:6 [INFO] [stdout] | [INFO] [stdout] 29 | let r1 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/references.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let r2 = &s; // no problem [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `some_string` [INFO] [stdout] --> src/references.rs:61:11 [INFO] [stdout] | [INFO] [stdout] 61 | fn change(some_string: &String) { [INFO] [stdout] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/references.rs:28:6 [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: `v` [INFO] [stdout] --> src/bin/collections/vectors.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let v: Vec = Vec::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `does_not_exit` [INFO] [stdout] --> src/bin/collections/vectors.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let does_not_exit = v.get(100); // type: Option<&i32> // this won't [INFO] [stdout] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exit` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/collections/vectors.rs:44:6 [INFO] [stdout] | [INFO] [stdout] 44 | for i in &v { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `row` [INFO] [stdout] --> src/bin/collections/vectors.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let row = vec![ [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_row` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `median` is never read [INFO] [stdout] --> src/bin/collections/vectors.rs:103:10 [INFO] [stdout] | [INFO] [stdout] 103 | let mut median: f64 = -1.0; [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: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:5:10 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: 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/collections/strings.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let s = data.to_string(); // type: String [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/bin/iterators.rs:93:6 [INFO] [stdout] | [INFO] [stdout] 93 | let x: Vec<_> = v1.iter().map(|x| x + 1).collect(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [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/collections/strings.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | 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/collections/strings.rs:11:6 [INFO] [stdout] | [INFO] [stdout] 11 | let hello = String::from("السلام عليكم"); [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/collections/strings.rs:12:9 [INFO] [stdout] | [INFO] [stdout] 12 | 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/collections/strings.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | 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/collections/strings.rs:14:9 [INFO] [stdout] | [INFO] [stdout] 14 | let hello = String::from("שָׁלוֹם"); [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/collections/strings.rs:15:9 [INFO] [stdout] | [INFO] [stdout] 15 | let hello = String::from("नमस्ते"); [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/collections/strings.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let hello = String::from("こんにちは"); [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/collections/strings.rs:17:9 [INFO] [stdout] | [INFO] [stdout] 17 | let hello = String::from("안녕하세요"); [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/collections/strings.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("你好"); [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/collections/strings.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Olá"); [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/collections/strings.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | 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/collections/strings.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | 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: unused variable: `s3` [INFO] [stdout] --> src/bin/collections/strings.rs:39:6 [INFO] [stdout] | [INFO] [stdout] 39 | let s3 = s1 + &s2; // NOTE: s1 has been moved here and can no longer be used [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:46:9 [INFO] [stdout] | [INFO] [stdout] 46 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/collections/strings.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | let s1 = String::from("hello"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/collections/strings.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let hello = String::from("Hola"); // len is 4 each character in UTF-8 is 1 byte [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/collections/strings.rs:54:6 [INFO] [stdout] | [INFO] [stdout] 54 | let hello = String::from("З3дравствуйте"); // len is 24 not 12 [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let s = &hello[0..4]; // type: &str (actual bytes) [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `k2` [INFO] [stdout] --> src/bin/collections/hashmaps.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let k2 = String::from("world"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_k2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/collections/strings.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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: `guess` [INFO] [stdout] --> src/data-types.rs:9:6 [INFO] [stdout] | [INFO] [stdout] 9 | let guess: u32 = "43".parse().expect("this is not a number"); // works: [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c1` [INFO] [stdout] --> src/lib.rs:87:13 [INFO] [stdout] | [INFO] [stdout] 87 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:12:6 [INFO] [stdout] | [INFO] [stdout] 12 | let x: i8; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:13:6 [INFO] [stdout] | [INFO] [stdout] 13 | let x: u8; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:14:6 [INFO] [stdout] | [INFO] [stdout] 14 | let x: i16; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let x: u16; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:16:6 [INFO] [stdout] | [INFO] [stdout] 16 | let x: i32; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:17:6 [INFO] [stdout] | [INFO] [stdout] 17 | let x: u32; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:18:6 [INFO] [stdout] | [INFO] [stdout] 18 | let x: i64; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:19:6 [INFO] [stdout] | [INFO] [stdout] 19 | let x: u64; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:20:6 [INFO] [stdout] | [INFO] [stdout] 20 | let x: i128; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:21:6 [INFO] [stdout] | [INFO] [stdout] 21 | let x: u128; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:22:6 [INFO] [stdout] | [INFO] [stdout] 22 | let x: isize; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:23:6 [INFO] [stdout] | [INFO] [stdout] 23 | let x: usize; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:26:6 [INFO] [stdout] | [INFO] [stdout] 26 | let x = 2.0; // defaults to f64 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> src/data-types.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let y: f32 = 3.0; // f32 [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/data-types.rs:30:6 [INFO] [stdout] | [INFO] [stdout] 30 | let t = true; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f` [INFO] [stdout] --> src/data-types.rs:31:6 [INFO] [stdout] | [INFO] [stdout] 31 | let f: bool = false; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c` [INFO] [stdout] --> src/data-types.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let c = 'z'; // char [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/data-types.rs:37:6 [INFO] [stdout] | [INFO] [stdout] 37 | let z = 'ℤ'; // char [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `heart_eyed_cat` [INFO] [stdout] --> src/data-types.rs:38:6 [INFO] [stdout] | [INFO] [stdout] 38 | let heart_eyed_cat = '😻'; // char [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> src/data-types.rs:45:7 [INFO] [stdout] | [INFO] [stdout] 45 | let (x, y, z) = tup; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `z` [INFO] [stdout] --> src/data-types.rs:45:13 [INFO] [stdout] | [INFO] [stdout] 45 | let (x, y, z) = tup; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `five_hundred` [INFO] [stdout] --> src/data-types.rs:48:6 [INFO] [stdout] | [INFO] [stdout] 48 | let five_hundred = tup.0; [INFO] [stdout] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_five_hundred` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six_point_four` [INFO] [stdout] --> src/data-types.rs:49:9 [INFO] [stdout] | [INFO] [stdout] 49 | let six_point_four =tup.1; [INFO] [stdout] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_six_point_four` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `one` [INFO] [stdout] --> src/data-types.rs:50:9 [INFO] [stdout] | [INFO] [stdout] 50 | let one = tup.2; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_one` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/data-types.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let a = [1, 2, 3, 4, 5]; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> src/data-types.rs:55:6 [INFO] [stdout] | [INFO] [stdout] 55 | let a: [i32; 5] = [1,2,3,4,5]; // an array of 5 i32's [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `c2` [INFO] [stdout] --> src/lib.rs:87:31 [INFO] [stdout] | [INFO] [stdout] 87 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_c2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `fisrt` [INFO] [stdout] --> src/data-types.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let fisrt =a[0]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_fisrt` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let slice = &s[0..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | let slice = &s[..2]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:9:6 [INFO] [stdout] | [INFO] [stdout] 9 | let slice = &s[3..s.len()]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `slice` [INFO] [stdout] --> src/slices.rs:10:6 [INFO] [stdout] | [INFO] [stdout] 10 | let slice = &s[3..]; [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:22:7 [INFO] [stdout] | [INFO] [stdout] 22 | let word = first_word_better(&s[..]); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:23:7 [INFO] [stdout] | [INFO] [stdout] 23 | let word = first_word_better(&string_literal[..]); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `word` [INFO] [stdout] --> src/slices.rs:25:7 [INFO] [stdout] | [INFO] [stdout] 25 | let word = first_word_better(string_literal); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/slices.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::from("hello world"); [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: `k2` [INFO] [stdout] --> src/bin/collections/hashmaps.rs:70:7 [INFO] [stdout] | [INFO] [stdout] 70 | let k2 = String::from("world"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_k2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/generics/main.rs:79:56 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [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/generics/main.rs:79:63 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/bin/generics/main.rs:81:31 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(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] --> src/bin/generics/main.rs:81:38 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(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 variable: `integer` [INFO] [stdout] --> src/bin/generics/main.rs:170:6 [INFO] [stdout] | [INFO] [stdout] 170 | let integer =Point {x: 32, y: 23}; [INFO] [stdout] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `intfloat` [INFO] [stdout] --> src/bin/generics/main.rs:173:6 [INFO] [stdout] | [INFO] [stdout] 173 | let intfloat = Point2 {x: 3.2, y: 32}; [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intfloat` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `new_tweet` [INFO] [stdout] --> src/bin/generics/main.rs:212:6 [INFO] [stdout] | [INFO] [stdout] 212 | let new_tweet = return_summarizable(); [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_tweet` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/generics/main.rs:7:2 [INFO] [stdout] | [INFO] [stdout] 7 | y: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `x` [INFO] [stdout] --> src/bin/generics/main.rs:11:5 [INFO] [stdout] | [INFO] [stdout] 11 | x: T, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `y` [INFO] [stdout] --> src/bin/generics/main.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 12 | y: U, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum is never used: `Option` [INFO] [stdout] --> src/bin/generics/main.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | enum Option { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum is never used: `Result` [INFO] [stdout] --> src/bin/generics/main.rs:20:6 [INFO] [stdout] | [INFO] [stdout] 20 | enum Result { [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `distance_from_origin` [INFO] [stdout] --> src/bin/generics/main.rs:32:5 [INFO] [stdout] | [INFO] [stdout] 32 | fn distance_from_origin(&self) -> f32 { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `mixup` [INFO] [stdout] --> src/bin/generics/main.rs:38:5 [INFO] [stdout] | [INFO] [stdout] 38 | fn mixup(self, other: Point2) -> Point2 { [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `notify_mult_impl` [INFO] [stdout] --> src/bin/generics/main.rs:70:4 [INFO] [stdout] | [INFO] [stdout] 70 | fn notify_mult_impl(item: &T) { [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function` [INFO] [stdout] --> src/bin/generics/main.rs:79:4 [INFO] [stdout] | [INFO] [stdout] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `some_function_where_` [INFO] [stdout] --> src/bin/generics/main.rs:81:4 [INFO] [stdout] | [INFO] [stdout] 81 | fn some_function_where_(t: &T, u: &U) -> i32 [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_clone` [INFO] [stdout] --> src/bin/generics/main.rs:107:4 [INFO] [stdout] | [INFO] [stdout] 107 | fn largest_clone(list: &[T]) -> T { [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `largest_using_return_ref` [INFO] [stdout] --> src/bin/generics/main.rs:118:4 [INFO] [stdout] | [INFO] [stdout] 118 | fn largest_using_return_ref(list: &[T]) -> &T { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct is never constructed: `Pair` [INFO] [stdout] --> src/bin/generics/main.rs:130:8 [INFO] [stdout] | [INFO] [stdout] 130 | struct Pair { [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `new` [INFO] [stdout] --> src/bin/generics/main.rs:136:5 [INFO] [stdout] | [INFO] [stdout] 136 | fn new(x: T, y: T) -> Self { [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated function is never used: `cmp_display` [INFO] [stdout] --> src/bin/generics/main.rs:142:5 [INFO] [stdout] | [INFO] [stdout] 142 | fn cmp_display(&self) { // fn is only implement when generic type of T conform to PartialOrd and Display trait [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait method `summarizeDef` should have a snake case name [INFO] [stdout] --> src/bin/generics/traits.rs:14:5 [INFO] [stdout] | [INFO] [stdout] 14 | fn summarizeDef(&self) -> String { [INFO] [stdout] | ^^^^^^^^^^^^ help: convert the identifier to snake case: `summarize_def` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/enums/enums2.rs:19:6 [INFO] [stdout] | [INFO] [stdout] 19 | let v = value_in_cents(c); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `six` [INFO] [stdout] --> src/enums/enums2.rs:27:6 [INFO] [stdout] | [INFO] [stdout] 27 | let six = plus_one(five); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `none` [INFO] [stdout] --> src/enums/enums2.rs:28:6 [INFO] [stdout] | [INFO] [stdout] 28 | let none = plus_one(None); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `count` is assigned to, but never used [INFO] [stdout] --> src/enums/enums2.rs:54:10 [INFO] [stdout] | [INFO] [stdout] 54 | let mut count = 0; [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: consider using `_count` instead [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `count` is never read [INFO] [stdout] --> src/enums/enums2.rs:59:3 [INFO] [stdout] | [INFO] [stdout] 59 | count += 1; [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: variant is never constructed: `Penny` [INFO] [stdout] --> src/enums/enums2.rs:4:2 [INFO] [stdout] | [INFO] [stdout] 4 | Penny, [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant is never constructed: `Nickel` [INFO] [stdout] --> src/enums/enums2.rs:5:2 [INFO] [stdout] | [INFO] [stdout] 5 | Nickel, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `contents` [INFO] [stdout] --> src/main.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | let contents = format!("{}\t{}\n", key, value); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_contents` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `v` [INFO] [stdout] --> src/bin/collections/vectors.rs:6:6 [INFO] [stdout] | [INFO] [stdout] 6 | let v: Vec = Vec::new(); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `does_not_exit` [INFO] [stdout] --> src/bin/collections/vectors.rs:34:6 [INFO] [stdout] | [INFO] [stdout] 34 | let does_not_exit = v.get(100); // type: Option<&i32> // this won't [INFO] [stdout] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exit` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/bin/collections/vectors.rs:44:6 [INFO] [stdout] | [INFO] [stdout] 44 | for i in &v { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `row` [INFO] [stdout] --> src/bin/collections/vectors.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let row = vec![ [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_row` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `median` is never read [INFO] [stdout] --> src/bin/collections/vectors.rs:103:10 [INFO] [stdout] | [INFO] [stdout] 103 | let mut median: f64 = -1.0; [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: unused variable: `rect1` [INFO] [stdout] --> src/structs/structs2.rs:15:6 [INFO] [stdout] | [INFO] [stdout] 15 | let rect1 = Rectangle { [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect1` [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/collections/strings.rs:5:10 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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/collections/strings.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | let s = data.to_string(); // type: 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/collections/strings.rs:8:6 [INFO] [stdout] | [INFO] [stdout] 8 | 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/collections/strings.rs:11:6 [INFO] [stdout] | [INFO] [stdout] 11 | let hello = String::from("السلام عليكم"); [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/collections/strings.rs:12:9 [INFO] [stdout] | [INFO] [stdout] 12 | 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/collections/strings.rs:13:9 [INFO] [stdout] | [INFO] [stdout] 13 | 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/collections/strings.rs:14:9 [INFO] [stdout] | [INFO] [stdout] 14 | let hello = String::from("שָׁלוֹם"); [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/collections/strings.rs:15:9 [INFO] [stdout] | [INFO] [stdout] 15 | let hello = String::from("नमस्ते"); [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/collections/strings.rs:16:9 [INFO] [stdout] | [INFO] [stdout] 16 | let hello = String::from("こんにちは"); [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/collections/strings.rs:17:9 [INFO] [stdout] | [INFO] [stdout] 17 | let hello = String::from("안녕하세요"); [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/collections/strings.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let hello = String::from("你好"); [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/collections/strings.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let hello = String::from("Olá"); [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/collections/strings.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | 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/collections/strings.rs:21:9 [INFO] [stdout] | [INFO] [stdout] 21 | 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: unused variable: `s3` [INFO] [stdout] --> src/bin/collections/strings.rs:39:6 [INFO] [stdout] | [INFO] [stdout] 39 | let s3 = s1 + &s2; // NOTE: s1 has been moved here and can no longer be used [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:46:9 [INFO] [stdout] | [INFO] [stdout] 46 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/bin/collections/strings.rs:50:6 [INFO] [stdout] | [INFO] [stdout] 50 | let s1 = String::from("hello"); [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `hello` [INFO] [stdout] --> src/bin/collections/strings.rs:53:6 [INFO] [stdout] | [INFO] [stdout] 53 | let hello = String::from("Hola"); // len is 4 each character in UTF-8 is 1 byte [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/collections/strings.rs:54:6 [INFO] [stdout] | [INFO] [stdout] 54 | let hello = String::from("З3дравствуйте"); // len is 24 not 12 [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s` [INFO] [stdout] --> src/bin/collections/strings.rs:57:6 [INFO] [stdout] | [INFO] [stdout] 57 | let s = &hello[0..4]; // type: &str (actual bytes) [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `width` [INFO] [stdout] --> src/structs/structs2.rs:4:2 [INFO] [stdout] | [INFO] [stdout] 4 | width: u32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `height` [INFO] [stdout] --> src/structs/structs2.rs:5:2 [INFO] [stdout] | [INFO] [stdout] 5 | height: u32, [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `width` [INFO] [stdout] --> src/structs/structs2.rs:10:2 [INFO] [stdout] | [INFO] [stdout] 10 | width: u32, [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `RectangleDebug` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/structs/structs2.rs:8:10 [INFO] [stdout] | [INFO] [stdout] 8 | #[derive(Debug)] // opt into including debugging information on this struct [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field is never read: `height` [INFO] [stdout] --> src/structs/structs2.rs:11:2 [INFO] [stdout] | [INFO] [stdout] 11 | height: u32 [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: `RectangleDebug` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> src/structs/structs2.rs:8:10 [INFO] [stdout] | [INFO] [stdout] 8 | #[derive(Debug)] // opt into including debugging information on this struct [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/bin/collections/strings.rs:5:6 [INFO] [stdout] | [INFO] [stdout] 5 | let mut s = String::new(); // type: String [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: 6 warnings emitted [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: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 28 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 23 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 27 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 7 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 21 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning 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: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 4.96s [INFO] running `Command { std: "docker" "inspect" "c1203f0c61f606d0879fae2b329943278d187424f4c2c6b93af843d7843493e9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c1203f0c61f606d0879fae2b329943278d187424f4c2c6b93af843d7843493e9", kill_on_drop: false }` [INFO] [stdout] c1203f0c61f606d0879fae2b329943278d187424f4c2c6b93af843d7843493e9 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 909eabb35321684902fe7ec7aaf59f57c6dc1769831c1880423e916f74c0c25d [INFO] running `Command { std: "docker" "start" "-a" "909eabb35321684902fe7ec7aaf59f57c6dc1769831c1880423e916f74c0c25d", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] warning: unused variable: `c1` [INFO] [stderr] --> src/lib.rs:87:13 [INFO] [stderr] | [INFO] [stderr] 87 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_c1` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c2` [INFO] [stderr] --> src/lib.rs:87:31 [INFO] [stderr] | [INFO] [stderr] 87 | pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor { [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_c2` [INFO] [stderr] [INFO] [stderr] warning: `rust-cheatsheet` (lib) generated 2 warnings [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/slices.rs:7:6 [INFO] [stderr] | [INFO] [stderr] 7 | let slice = &s[0..2]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/slices.rs:8:6 [INFO] [stderr] | [INFO] [stderr] 8 | let slice = &s[..2]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/slices.rs:9:6 [INFO] [stderr] | [INFO] [stderr] 9 | let slice = &s[3..s.len()]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/slices.rs:10:6 [INFO] [stderr] | [INFO] [stderr] 10 | let slice = &s[3..]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `word` [INFO] [stderr] --> src/slices.rs:22:7 [INFO] [stderr] | [INFO] [stderr] 22 | let word = first_word_better(&s[..]); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `word` [INFO] [stderr] --> src/slices.rs:23:7 [INFO] [stderr] | [INFO] [stderr] 23 | let word = first_word_better(&string_literal[..]); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `word` [INFO] [stderr] --> src/slices.rs:25:7 [INFO] [stderr] | [INFO] [stderr] 25 | let word = first_word_better(string_literal); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/slices.rs:5:6 [INFO] [stderr] | [INFO] [stderr] 5 | let mut s = String::from("hello world"); [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-cheatsheet` (lib test) generated 2 warnings (2 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "slices") generated 8 warnings [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/bin/generics/main.rs:79:56 [INFO] [stderr] | [INFO] [stderr] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [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/generics/main.rs:79:63 [INFO] [stderr] | [INFO] [stderr] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/bin/generics/main.rs:81:31 [INFO] [stderr] | [INFO] [stderr] 81 | fn some_function_where_(t: &T, u: &U) -> i32 [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `u` [INFO] [stderr] --> src/bin/generics/main.rs:81:38 [INFO] [stderr] | [INFO] [stderr] 81 | fn some_function_where_(t: &T, u: &U) -> i32 [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_u` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `integer` [INFO] [stderr] --> src/bin/generics/main.rs:170:6 [INFO] [stderr] | [INFO] [stderr] 170 | let integer =Point {x: 32, y: 23}; [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_integer` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `intfloat` [INFO] [stderr] --> src/bin/generics/main.rs:173:6 [INFO] [stderr] | [INFO] [stderr] 173 | let intfloat = Point2 {x: 3.2, y: 32}; [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_intfloat` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `new_tweet` [INFO] [stderr] --> src/bin/generics/main.rs:212:6 [INFO] [stderr] | [INFO] [stderr] 212 | let new_tweet = return_summarizable(); [INFO] [stderr] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_tweet` [INFO] [stderr] [INFO] [stderr] warning: field is never read: `y` [INFO] [stderr] --> src/bin/generics/main.rs:7:2 [INFO] [stderr] | [INFO] [stderr] 7 | y: T, [INFO] [stderr] | ^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `x` [INFO] [stderr] --> src/bin/generics/main.rs:11:5 [INFO] [stderr] | [INFO] [stderr] 11 | x: T, [INFO] [stderr] | ^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never read: `y` [INFO] [stderr] --> src/bin/generics/main.rs:12:5 [INFO] [stderr] | [INFO] [stderr] 12 | y: U, [INFO] [stderr] | ^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `Option` [INFO] [stderr] --> src/bin/generics/main.rs:15:6 [INFO] [stderr] | [INFO] [stderr] 15 | enum Option { [INFO] [stderr] | ^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: enum is never used: `Result` [INFO] [stderr] --> src/bin/generics/main.rs:20:6 [INFO] [stderr] | [INFO] [stderr] 20 | enum Result { [INFO] [stderr] | ^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `distance_from_origin` [INFO] [stderr] --> src/bin/generics/main.rs:32:5 [INFO] [stderr] | [INFO] [stderr] 32 | fn distance_from_origin(&self) -> f32 { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `mixup` [INFO] [stderr] --> src/bin/generics/main.rs:38:5 [INFO] [stderr] | [INFO] [stderr] 38 | fn mixup(self, other: Point2) -> Point2 { [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `notify_mult_impl` [INFO] [stderr] --> src/bin/generics/main.rs:70:4 [INFO] [stderr] | [INFO] [stderr] 70 | fn notify_mult_impl(item: &T) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `some_function` [INFO] [stderr] --> src/bin/generics/main.rs:79:4 [INFO] [stderr] | [INFO] [stderr] 79 | fn some_function(t: &T, u: &U) -> i32 {5} [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `some_function_where_` [INFO] [stderr] --> src/bin/generics/main.rs:81:4 [INFO] [stderr] | [INFO] [stderr] 81 | fn some_function_where_(t: &T, u: &U) -> i32 [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `largest_clone` [INFO] [stderr] --> src/bin/generics/main.rs:107:4 [INFO] [stderr] | [INFO] [stderr] 107 | fn largest_clone(list: &[T]) -> T { [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `largest_using_return_ref` [INFO] [stderr] --> src/bin/generics/main.rs:118:4 [INFO] [stderr] | [INFO] [stderr] 118 | fn largest_using_return_ref(list: &[T]) -> &T { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Pair` [INFO] [stderr] --> src/bin/generics/main.rs:130:8 [INFO] [stderr] | [INFO] [stderr] 130 | struct Pair { [INFO] [stderr] | ^^^^ [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `new` [INFO] [stderr] --> src/bin/generics/main.rs:136:5 [INFO] [stderr] | [INFO] [stderr] 136 | fn new(x: T, y: T) -> Self { [INFO] [stderr] | ^^^ [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `cmp_display` [INFO] [stderr] --> src/bin/generics/main.rs:142:5 [INFO] [stderr] | [INFO] [stderr] 142 | fn cmp_display(&self) { // fn is only implement when generic type of T conform to PartialOrd and Display trait [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: trait method `summarizeDef` should have a snake case name [INFO] [stderr] --> src/bin/generics/traits.rs:14:5 [INFO] [stderr] | [INFO] [stderr] 14 | fn summarizeDef(&self) -> String { [INFO] [stderr] | ^^^^^^^^^^^^ help: convert the identifier to snake case: `summarize_def` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `user3` [INFO] [stderr] --> src/structs/structs1.rs:18:6 [INFO] [stderr] | [INFO] [stderr] 18 | let user3 = User { [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user3` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `black` [INFO] [stderr] --> src/structs/structs1.rs:26:6 [INFO] [stderr] | [INFO] [stderr] 26 | let black = Color(0, 0, 0); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_black` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `oirigin` [INFO] [stderr] --> src/structs/structs1.rs:27:6 [INFO] [stderr] | [INFO] [stderr] 27 | let oirigin = Point(0, 0, 0); [INFO] [stderr] | ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_oirigin` [INFO] [stderr] [INFO] [stderr] warning: field is never read: `username` [INFO] [stderr] --> src/structs/structs1.rs:52:2 [INFO] [stderr] | [INFO] [stderr] 52 | username: String, [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `sign_in_count` [INFO] [stderr] --> src/structs/structs1.rs:54:2 [INFO] [stderr] | [INFO] [stderr] 54 | sign_in_count: u64, [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never read: `active` [INFO] [stderr] --> src/structs/structs1.rs:55:2 [INFO] [stderr] | [INFO] [stderr] 55 | active: bool, [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/bin/iterators.rs:93:6 [INFO] [stderr] | [INFO] [stderr] 93 | let x: Vec<_> = v1.iter().map(|x| x + 1).collect(); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `shoes_in_size` [INFO] [stderr] --> src/bin/iterators.rs:10:4 [INFO] [stderr] | [INFO] [stderr] 10 | fn shoes_in_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: `s` [INFO] [stderr] --> src/bin/collections/strings.rs:5:10 [INFO] [stderr] | [INFO] [stderr] 5 | let mut s = String::new(); // type: String [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/collections/strings.rs:7:6 [INFO] [stderr] | [INFO] [stderr] 7 | let s = data.to_string(); // type: 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/collections/strings.rs:8:6 [INFO] [stderr] | [INFO] [stderr] 8 | 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/collections/strings.rs:11:6 [INFO] [stderr] | [INFO] [stderr] 11 | let hello = String::from("السلام عليكم"); [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/collections/strings.rs:12:9 [INFO] [stderr] | [INFO] [stderr] 12 | 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/collections/strings.rs:13:9 [INFO] [stderr] | [INFO] [stderr] 13 | 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/collections/strings.rs:14:9 [INFO] [stderr] | [INFO] [stderr] 14 | let hello = String::from("שָׁלוֹם"); [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/collections/strings.rs:15:9 [INFO] [stderr] | [INFO] [stderr] 15 | let hello = String::from("नमस्ते"); [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/collections/strings.rs:16:9 [INFO] [stderr] | [INFO] [stderr] 16 | let hello = String::from("こんにちは"); [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/collections/strings.rs:17:9 [INFO] [stderr] | [INFO] [stderr] 17 | let hello = String::from("안녕하세요"); [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/collections/strings.rs:18:9 [INFO] [stderr] | [INFO] [stderr] 18 | let hello = String::from("你好"); [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/collections/strings.rs:19:9 [INFO] [stderr] | [INFO] [stderr] 19 | let hello = String::from("Olá"); [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/collections/strings.rs:20:9 [INFO] [stderr] | [INFO] [stderr] 20 | 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/collections/strings.rs:21:9 [INFO] [stderr] | [INFO] [stderr] 21 | let hello = String::from("Hola"); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s3` [INFO] [stderr] --> src/bin/collections/strings.rs:39:6 [INFO] [stderr] | [INFO] [stderr] 39 | let s3 = s1 + &s2; // NOTE: s1 has been moved here and can no longer be used [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/bin/collections/strings.rs:46:9 [INFO] [stderr] | [INFO] [stderr] 46 | let s = format!("{}-{}-{}", s1, s2, s3); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s1` [INFO] [stderr] --> src/bin/collections/strings.rs:50:6 [INFO] [stderr] | [INFO] [stderr] 50 | let s1 = String::from("hello"); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `hello` [INFO] [stderr] --> src/bin/collections/strings.rs:53:6 [INFO] [stderr] | [INFO] [stderr] 53 | let hello = String::from("Hola"); // len is 4 each character in UTF-8 is 1 byte [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/collections/strings.rs:54:6 [INFO] [stderr] | [INFO] [stderr] 54 | let hello = String::from("З3дравствуйте"); // len is 24 not 12 [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/bin/collections/strings.rs:57:6 [INFO] [stderr] | [INFO] [stderr] 57 | let s = &hello[0..4]; // type: &str (actual bytes) [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/bin/collections/strings.rs:5:6 [INFO] [stderr] | [INFO] [stderr] 5 | let mut s = String::new(); // type: String [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: `guess` [INFO] [stderr] --> src/data-types.rs:9:6 [INFO] [stderr] | [INFO] [stderr] 9 | let guess: u32 = "43".parse().expect("this is not a number"); // works: [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_guess` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:12:6 [INFO] [stderr] | [INFO] [stderr] 12 | let x: i8; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:13:6 [INFO] [stderr] | [INFO] [stderr] 13 | let x: u8; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:14:6 [INFO] [stderr] | [INFO] [stderr] 14 | let x: i16; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:15:6 [INFO] [stderr] | [INFO] [stderr] 15 | let x: u16; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:16:6 [INFO] [stderr] | [INFO] [stderr] 16 | let x: i32; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:17:6 [INFO] [stderr] | [INFO] [stderr] 17 | let x: u32; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:18:6 [INFO] [stderr] | [INFO] [stderr] 18 | let x: i64; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:19:6 [INFO] [stderr] | [INFO] [stderr] 19 | let x: u64; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:20:6 [INFO] [stderr] | [INFO] [stderr] 20 | let x: i128; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:21:6 [INFO] [stderr] | [INFO] [stderr] 21 | let x: u128; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:22:6 [INFO] [stderr] | [INFO] [stderr] 22 | let x: isize; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:23:6 [INFO] [stderr] | [INFO] [stderr] 23 | let x: usize; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:26:6 [INFO] [stderr] | [INFO] [stderr] 26 | let x = 2.0; // defaults to f64 [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/data-types.rs:27:6 [INFO] [stderr] | [INFO] [stderr] 27 | let y: f32 = 3.0; // f32 [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `t` [INFO] [stderr] --> src/data-types.rs:30:6 [INFO] [stderr] | [INFO] [stderr] 30 | let t = true; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/data-types.rs:31:6 [INFO] [stderr] | [INFO] [stderr] 31 | let f: bool = false; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `c` [INFO] [stderr] --> src/data-types.rs:34:6 [INFO] [stderr] | [INFO] [stderr] 34 | let c = 'z'; // char [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_c` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `z` [INFO] [stderr] --> src/data-types.rs:37:6 [INFO] [stderr] | [INFO] [stderr] 37 | let z = 'ℤ'; // char [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `heart_eyed_cat` [INFO] [stderr] --> src/data-types.rs:38:6 [INFO] [stderr] | [INFO] [stderr] 38 | let heart_eyed_cat = '😻'; // char [INFO] [stderr] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/data-types.rs:45:7 [INFO] [stderr] | [INFO] [stderr] 45 | let (x, y, z) = tup; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `z` [INFO] [stderr] --> src/data-types.rs:45:13 [INFO] [stderr] | [INFO] [stderr] 45 | let (x, y, z) = tup; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_z` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `five_hundred` [INFO] [stderr] --> src/data-types.rs:48:6 [INFO] [stderr] | [INFO] [stderr] 48 | let five_hundred = tup.0; [INFO] [stderr] | ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_five_hundred` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `six_point_four` [INFO] [stderr] --> src/data-types.rs:49:9 [INFO] [stderr] | [INFO] [stderr] 49 | let six_point_four =tup.1; [INFO] [stderr] | ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_six_point_four` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `one` [INFO] [stderr] --> src/data-types.rs:50:9 [INFO] [stderr] | [INFO] [stderr] 50 | let one = tup.2; [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_one` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `a` [INFO] [stderr] --> src/data-types.rs:53:6 [INFO] [stderr] | [INFO] [stderr] 53 | let a = [1, 2, 3, 4, 5]; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `a` [INFO] [stderr] --> src/data-types.rs:55:6 [INFO] [stderr] | [INFO] [stderr] 55 | let a: [i32; 5] = [1,2,3,4,5]; // an array of 5 i32's [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `fisrt` [INFO] [stderr] --> src/data-types.rs:57:6 [INFO] [stderr] | [INFO] [stderr] 57 | let fisrt =a[0]; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_fisrt` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `k2` [INFO] [stderr] --> src/bin/collections/hashmaps.rs:70:7 [INFO] [stderr] | [INFO] [stderr] 70 | let k2 = String::from("world"); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_k2` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `rect1` [INFO] [stderr] --> src/structs/structs2.rs:15:6 [INFO] [stderr] | [INFO] [stderr] 15 | let rect1 = Rectangle { [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_rect1` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `width` [INFO] [stderr] --> src/structs/structs2.rs:4:2 [INFO] [stderr] | [INFO] [stderr] 4 | width: u32, [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `height` [INFO] [stderr] --> src/structs/structs2.rs:5:2 [INFO] [stderr] | [INFO] [stderr] 5 | height: u32, [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: field is never read: `width` [INFO] [stderr] --> src/structs/structs2.rs:10:2 [INFO] [stderr] | [INFO] [stderr] 10 | width: u32, [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] note: `RectangleDebug` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] --> src/structs/structs2.rs:8:10 [INFO] [stderr] | [INFO] [stderr] 8 | #[derive(Debug)] // opt into including debugging information on this struct [INFO] [stderr] | ^^^^^ [INFO] [stderr] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: field is never read: `height` [INFO] [stderr] --> src/structs/structs2.rs:11:2 [INFO] [stderr] | [INFO] [stderr] 11 | height: u32 [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] note: `RectangleDebug` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] --> src/structs/structs2.rs:8:10 [INFO] [stderr] | [INFO] [stderr] 8 | #[derive(Debug)] // opt into including debugging information on this struct [INFO] [stderr] | ^^^^^ [INFO] [stderr] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused variable: `contents` [INFO] [stderr] --> src/main.rs:11:9 [INFO] [stderr] | [INFO] [stderr] 11 | let contents = format!("{}\t{}\n", key, value); [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_contents` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/ownership.rs:14:6 [INFO] [stderr] | [INFO] [stderr] 14 | let y = x; // copies x to y [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: `s2` [INFO] [stderr] --> src/ownership.rs:20:7 [INFO] [stderr] | [INFO] [stderr] 20 | let s2 = s1; // s1 is considered invalid now [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s1` [INFO] [stderr] --> src/ownership.rs:64:6 [INFO] [stderr] | [INFO] [stderr] 64 | let s1 = gives_ownership(); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s3` [INFO] [stderr] --> src/ownership.rs:66:6 [INFO] [stderr] | [INFO] [stderr] 66 | let s3 = takes_and_gives_back(s2); // takes s2 then gives it back [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s2` [INFO] [stderr] --> src/ownership.rs:70:7 [INFO] [stderr] | [INFO] [stderr] 70 | let (s2, len) = calculate_length(s1); // rember s1 is moved into function [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `len` [INFO] [stderr] --> src/ownership.rs:70:11 [INFO] [stderr] | [INFO] [stderr] 70 | let (s2, len) = calculate_length(s1); // rember s1 is moved into function [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/ownership.rs:74:20 [INFO] [stderr] | [INFO] [stderr] 74 | fn take_ownership (s: String) { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `n` [INFO] [stderr] --> src/ownership.rs:78:15 [INFO] [stderr] | [INFO] [stderr] 78 | fn makes_copy(n :i32) { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `v` [INFO] [stderr] --> src/bin/collections/vectors.rs:6:6 [INFO] [stderr] | [INFO] [stderr] 6 | let v: Vec = Vec::new(); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `does_not_exit` [INFO] [stderr] --> src/bin/collections/vectors.rs:34:6 [INFO] [stderr] | [INFO] [stderr] 34 | let does_not_exit = v.get(100); // type: Option<&i32> // this won't [INFO] [stderr] | ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_does_not_exit` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/bin/collections/vectors.rs:44:6 [INFO] [stderr] | [INFO] [stderr] 44 | for i in &v { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `row` [INFO] [stderr] --> src/bin/collections/vectors.rs:57:6 [INFO] [stderr] | [INFO] [stderr] 57 | let row = vec![ [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_row` [INFO] [stderr] [INFO] [stderr] warning: value assigned to `median` is never read [INFO] [stderr] --> src/bin/collections/vectors.rs:103:10 [INFO] [stderr] | [INFO] [stderr] 103 | let mut median: f64 = -1.0; [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: `s` [INFO] [stderr] --> src/bin/collections/strings.rs:5:10 [INFO] [stderr] | [INFO] [stderr] 5 | let mut s = String::new(); // type: String [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `k2` [INFO] [stderr] --> src/bin/collections/hashmaps.rs:70:7 [INFO] [stderr] | [INFO] [stderr] 70 | let k2 = String::from("world"); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_k2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `len` [INFO] [stderr] --> src/references.rs:6:6 [INFO] [stderr] | [INFO] [stderr] 6 | let len = calculate_length(&s1); [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_len` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/references.rs:22:7 [INFO] [stderr] | [INFO] [stderr] 22 | let r1 = &mut s; [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/references.rs:29:6 [INFO] [stderr] | [INFO] [stderr] 29 | let r1 = &s; // no problem [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/references.rs:30:6 [INFO] [stderr] | [INFO] [stderr] 30 | let r2 = &s; // no problem [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `some_string` [INFO] [stderr] --> src/references.rs:61:11 [INFO] [stderr] | [INFO] [stderr] 61 | fn change(some_string: &String) { [INFO] [stderr] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/references.rs:28:6 [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: unused variable: `spaces` [INFO] [stderr] --> src/variables.rs:28:6 [INFO] [stderr] | [INFO] [stderr] 28 | let spaces = spaces.len(); // type: usize [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `spaces_mut` [INFO] [stderr] --> src/variables.rs:30:10 [INFO] [stderr] | [INFO] [stderr] 30 | let mut spaces_mut = " "; // type: &str [INFO] [stderr] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_spaces_mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/variables.rs:30:6 [INFO] [stderr] | [INFO] [stderr] 30 | let mut spaces_mut = " "; // type: &str [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: `v` [INFO] [stderr] --> src/enums/enums2.rs:19:6 [INFO] [stderr] | [INFO] [stderr] 19 | let v = value_in_cents(c); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_v` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `six` [INFO] [stderr] --> src/enums/enums2.rs:27:6 [INFO] [stderr] | [INFO] [stderr] 27 | let six = plus_one(five); [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_six` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `none` [INFO] [stderr] --> src/enums/enums2.rs:28:6 [INFO] [stderr] | [INFO] [stderr] 28 | let none = plus_one(None); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_none` [INFO] [stderr] [INFO] [stderr] warning: variable `count` is assigned to, but never used [INFO] [stderr] --> src/enums/enums2.rs:54:10 [INFO] [stderr] | [INFO] [stderr] 54 | let mut count = 0; [INFO] [stderr] | ^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: consider using `_count` instead [INFO] [stderr] [INFO] [stderr] warning: value assigned to `count` is never read [INFO] [stderr] --> src/enums/enums2.rs:59:3 [INFO] [stderr] | [INFO] [stderr] 59 | count += 1; [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: variant is never constructed: `Penny` [INFO] [stderr] --> src/enums/enums2.rs:4:2 [INFO] [stderr] | [INFO] [stderr] 4 | Penny, [INFO] [stderr] | ^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variant is never constructed: `Nickel` [INFO] [stderr] --> src/enums/enums2.rs:5:2 [INFO] [stderr] | [INFO] [stderr] 5 | Nickel, [INFO] [stderr] | ^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/bin/errors.rs:12:6 [INFO] [stderr] | [INFO] [stderr] 12 | let file = match f { [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/bin/errors.rs:24:6 [INFO] [stderr] | [INFO] [stderr] 24 | let f = File::open("hello.txt").unwrap_or_else(|error| { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/bin/errors.rs:36:6 [INFO] [stderr] | [INFO] [stderr] 36 | let f = File::open("hello.txt").unwrap(); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/bin/errors.rs:43:6 [INFO] [stderr] | [INFO] [stderr] 43 | let f =File::open("hello.txt").expect("error message couldn't blah blah..."); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/bin/errors.rs:50:6 [INFO] [stderr] | [INFO] [stderr] 50 | Ok(s) => println!("returned string with data"), [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused `Result` that must be used [INFO] [stderr] --> src/bin/errors.rs:65:2 [INFO] [stderr] | [INFO] [stderr] 65 | read_username_from_file_oneline("hello.txt"); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_must_use)]` on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/functions.rs:13:6 [INFO] [stderr] | [INFO] [stderr] 13 | let y = 6; // is a statement. [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: function is never used: `add_two` [INFO] [stderr] --> src/bin/testing.rs:6:4 [INFO] [stderr] | [INFO] [stderr] 6 | fn add_two(a: i32) -> i32 { [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: field is never read: `width` [INFO] [stderr] --> src/bin/testing.rs:100:5 [INFO] [stderr] | [INFO] [stderr] 100 | width: u32, [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] --> src/bin/testing.rs:98:10 [INFO] [stderr] | [INFO] [stderr] 98 | #[derive(Debug)] [INFO] [stderr] | ^^^^^ [INFO] [stderr] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: field is never read: `height` [INFO] [stderr] --> src/bin/testing.rs:101:5 [INFO] [stderr] | [INFO] [stderr] 101 | height: u32, [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] note: `Rectangle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stderr] --> src/bin/testing.rs:98:10 [INFO] [stderr] | [INFO] [stderr] 98 | #[derive(Debug)] [INFO] [stderr] | ^^^^^ [INFO] [stderr] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: `rust-cheatsheet` (bin "generics" test) generated 23 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "structs1") generated 6 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "iterators") generated 2 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "strings" test) generated 21 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "data-types" test) generated 28 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "hashmaps" test) generated 1 warning [INFO] [stderr] warning: `rust-cheatsheet` (bin "strings") generated 21 warnings (21 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "structs1" test) generated 6 warnings (6 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "structs2") generated 5 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "main" test) generated 1 warning [INFO] [stderr] warning: `rust-cheatsheet` (bin "iterators" test) generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust-cheatsheet` (bin "ownership") generated 8 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "vectors" test) generated 5 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "collections") generated 27 warnings (25 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "references") generated 6 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "variables" test) generated 3 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "enums2" test) generated 7 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "slices" test) generated 8 warnings (8 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "main") generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust-cheatsheet` (bin "variables") generated 3 warnings (3 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "data-types") generated 28 warnings (28 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "structs2" test) generated 5 warnings (5 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "collections" test) generated 27 warnings (27 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "errors" test) generated 6 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "errors") generated 6 warnings (6 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "functions") generated 1 warning [INFO] [stderr] warning: `rust-cheatsheet` (bin "ownership" test) generated 8 warnings (8 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "vectors") generated 5 warnings (5 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "hashmaps") generated 1 warning (1 duplicate) [INFO] [stderr] warning: `rust-cheatsheet` (bin "references" test) generated 6 warnings (6 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "generics") generated 23 warnings (23 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "enums2") generated 7 warnings (7 duplicates) [INFO] [stderr] warning: `rust-cheatsheet` (bin "testing") generated 3 warnings [INFO] [stderr] warning: `rust-cheatsheet` (bin "functions" test) generated 1 warning (1 duplicate) [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 1.00s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/rust_cheatsheet-c4725b2d5f0af04e) [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/closures-9589088e14c175f3) [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/collections-a13330f1ce748670) [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/control_flow-9d7c86029aba3974) [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/data_types-9ab5eaaed41bb564) [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/enums1-be3095131226f1be) [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/enums2-f269df30d68dcc07) [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/errors-841519cf44d56f2c) [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/functions-4d9e6c1777066f46) [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/generics-a11e9633d6d984bf) [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/hashmaps-74f3fd3589b3148d) [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/iterators-609af9865e343ea4) [INFO] [stdout] [INFO] [stdout] running 4 tests [INFO] [stdout] test tests::calling_next_directly ... ok [INFO] [stdout] test tests::filers_by_size ... ok [INFO] [stdout] test tests::iterator_sum ... ok [INFO] [stdout] test tests::using_other_iterator_trait_methods ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 4 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/lifetimes-a9a8ec67bd9f34d8) [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/main-875fa6f8212b38e4) [INFO] [stdout] running 0 tests [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/ownership-b5b0daebdbcb3dc1) [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/references-53df8d8b052d695e) [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/slices-d0efa8c49942ea82) [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] [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/strings-4219d9b2fccfce30) [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/structs1-a9cd637dc17ff3b2) [INFO] [stdout] [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/structs2-8d3e2104b55f9fe0) [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/structs3-87c6525a57023d8a) [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/testing-8a2966389472e7e9) [INFO] [stdout] [INFO] [stdout] running 9 tests [INFO] [stdout] test tests::expensive_test ... ignored [INFO] [stdout] test tests::exploration ... ok [INFO] [stdout] test tests::foooooooooooooo ... ok [INFO] [stdout] test tests::it_adds_two ... ok [INFO] [stdout] test tests::greeting_contains_name ... ok [INFO] [stdout] test tests::it_works ... ok [INFO] [stdout] test tests::larger_can_hold_smaller ... ok [INFO] [stdout] test tests::greater_than_100 - should panic ... ok [INFO] [stdout] test tests::great_than_100 - should panic ... ok [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/variables-4e61209a1b194e1a) [INFO] [stdout] [INFO] [stdout] test result: ok. 8 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.02s [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/vectors-0240d7d0aa75cb5e) [INFO] [stderr] Running tests/integration_test.rs (/opt/rustwide/target/debug/deps/integration_test-3bc0f7753d8aab96) [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] Doc-tests rust-cheatsheet [INFO] [stdout] [INFO] [stdout] running 4 tests [INFO] [stdout] test src/lib.rs - base::start (line 60) ... ok [INFO] [stdout] test src/lib.rs - theory::add_one (line 13) ... ok [INFO] [stdout] test src/lib.rs - theory::add_two (line 24) ... ok [INFO] [stdout] test src/lib.rs - theory::internal::check_addition (line 43) ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.47s [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "909eabb35321684902fe7ec7aaf59f57c6dc1769831c1880423e916f74c0c25d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "909eabb35321684902fe7ec7aaf59f57c6dc1769831c1880423e916f74c0c25d", kill_on_drop: false }` [INFO] [stdout] 909eabb35321684902fe7ec7aaf59f57c6dc1769831c1880423e916f74c0c25d