[INFO] cloning repository https://github.com/r00ster91/hello-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/r00ster91/hello-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fr00ster91%2Fhello-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fr00ster91%2Fhello-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 299a920791bf08daec35efd88efb0074cfbcf9dd
[INFO] testing r00ster91/hello-rust against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fr00ster91%2Fhello-rust" "/workspace/builds/worker-40/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-40/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/r00ster91/hello-rust 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 git repo https://github.com/r00ster91/hello-rust
[INFO] finished tweaking git repo https://github.com/r00ster91/hello-rust
[INFO] tweaked toml for git repo https://github.com/r00ster91/hello-rust written to /workspace/builds/worker-40/source/Cargo.toml
[INFO] crate git repo https://github.com/r00ster91/hello-rust 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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded ferris-says v0.2.1
[INFO] [stderr]   Downloaded textwrap v0.13.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-40/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-40/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] bb82a17bb18975e5555d5b683ae79aee0506b973de77769a3927cc81775b837d
[INFO] running `Command { std: "docker" "start" "-a" "bb82a17bb18975e5555d5b683ae79aee0506b973de77769a3927cc81775b837d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb82a17bb18975e5555d5b683ae79aee0506b973de77769a3927cc81775b837d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb82a17bb18975e5555d5b683ae79aee0506b973de77769a3927cc81775b837d", kill_on_drop: false }`
[INFO] [stdout] bb82a17bb18975e5555d5b683ae79aee0506b973de77769a3927cc81775b837d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-40/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-40/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] 62be233656ce5b66b6d2988345e9e0194b03ba868f795e8ebb8a98458926cd8a
[INFO] running `Command { std: "docker" "start" "-a" "62be233656ce5b66b6d2988345e9e0194b03ba868f795e8ebb8a98458926cd8a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.121
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]    Compiling smawk v0.3.1
[INFO] [stderr]    Compiling smallvec v0.4.5
[INFO] [stderr]    Compiling textwrap v0.13.4
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling ferris-says v0.2.1
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling hello-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rc::Rc`
[INFO] [stdout]    --> src/concurrency.rs:127:15
[INFO] [stdout]     |
[INFO] [stdout] 127 |     use std::{rc::Rc, sync::Arc};
[INFO] [stdout]     |               ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/miscellaneous.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::env;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process::exit`
[INFO] [stdout]  --> src/miscellaneous.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::process::exit;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]   --> src/patterns.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     if let x = 5 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]    = help: consider replacing the `if let` with a `let`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]  --> src/collections.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let v2 = vec![1, 2, 3];
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `non_existent2`
[INFO] [stdout]   --> src/collections.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let non_existent2 = v3.get(100);
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_non_existent2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `empty_string`
[INFO] [stdout]   --> src/collections.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |     let empty_string = String::new();
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_empty_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string1`
[INFO] [stdout]   --> src/collections.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let string1 = "hello".to_string();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string2`
[INFO] [stdout]   --> src/collections.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let string2 = String::from("hello");
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `non_ascii_string`
[INFO] [stdout]   --> src/collections.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let non_ascii_string = String::from("안녕하세요");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_non_ascii_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]    --> src/collections.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     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: `chars`
[INFO] [stdout]   --> src/generics_and_traits.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let chars = Point { x: 'a', y: 5 };
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `float`
[INFO] [stdout]   --> src/generics_and_traits.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let float = Point { x: 1.0, y: 4.0 };
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/generics_and_traits.rs:96:6
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn a(list: &i32) {
[INFO] [stdout]    |      ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/generics_and_traits.rs:99:6
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn b(list: &i8) {}
[INFO] [stdout]    |      ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/lifetimes.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/ownership.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let hello = &hw[..5];//same as 0..5
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/ownership.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let world = &hw[6..]; //same as 6..hw.len()
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `whole_string`
[INFO] [stdout]   --> src/ownership.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     let whole_string = &hw[..]; //same as 0..hw.len()
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_whole_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `literal`
[INFO] [stdout]   --> src/ownership.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let literal = "i am literally a literal";
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_literal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/ownership.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let slice = &a[1..3];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/smart_pointers.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structs.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     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: `origin`
[INFO] [stdout]   --> src/structs.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let origin = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest2`
[INFO] [stdout]   --> src/generics_and_traits.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn largest2<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest3`
[INFO] [stdout]   --> src/generics_and_traits.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn largest3<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_and_traits.rs:70:5
[INFO] [stdout]    |
[INFO] [stdout] 70 |     y: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `distance_from_origin`
[INFO] [stdout]   --> src/generics_and_traits.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/generics_and_traits.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     x: Wa,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_and_traits.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 93 |     y: Xwe,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `a`
[INFO] [stdout]   --> src/generics_and_traits.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn a(list: &i32) {
[INFO] [stdout]    |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `b`
[INFO] [stdout]   --> src/generics_and_traits.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn b(list: &i8) {}
[INFO] [stdout]    |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stdout]   --> src/lifetimes.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct ImportantExcerpt<'a> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     active: bool,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]    --> src/structs.rs:161:8
[INFO] [stdout]     |
[INFO] [stdout] 161 | struct Point(i32, i32, i32);
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 35 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 25s
[INFO] running `Command { std: "docker" "inspect" "62be233656ce5b66b6d2988345e9e0194b03ba868f795e8ebb8a98458926cd8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62be233656ce5b66b6d2988345e9e0194b03ba868f795e8ebb8a98458926cd8a", kill_on_drop: false }`
[INFO] [stdout] 62be233656ce5b66b6d2988345e9e0194b03ba868f795e8ebb8a98458926cd8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-40/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-40/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] c8dbd1d3f8a25f2864ec036bbcfa6d9006d13a3ea5d92d37ee7ab81cc574627b
[INFO] running `Command { std: "docker" "start" "-a" "c8dbd1d3f8a25f2864ec036bbcfa6d9006d13a3ea5d92d37ee7ab81cc574627b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling hello-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `rc::Rc`
[INFO] [stdout]    --> src/concurrency.rs:127:15
[INFO] [stdout]     |
[INFO] [stdout] 127 |     use std::{rc::Rc, sync::Arc};
[INFO] [stdout]     |               ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/miscellaneous.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::env;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process::exit`
[INFO] [stdout]  --> src/miscellaneous.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::process::exit;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]   --> src/patterns.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 |     if let x = 5 {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]    = help: consider replacing the `if let` with a `let`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]  --> src/collections.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let v2 = vec![1, 2, 3];
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `non_existent2`
[INFO] [stdout]   --> src/collections.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let non_existent2 = v3.get(100);
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_non_existent2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `empty_string`
[INFO] [stdout]   --> src/collections.rs:89:9
[INFO] [stdout]    |
[INFO] [stdout] 89 |     let empty_string = String::new();
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_empty_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string1`
[INFO] [stdout]   --> src/collections.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |     let string1 = "hello".to_string();
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string2`
[INFO] [stdout]   --> src/collections.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let string2 = String::from("hello");
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `non_ascii_string`
[INFO] [stdout]   --> src/collections.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let non_ascii_string = String::from("안녕하세요");
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_non_ascii_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]    --> src/collections.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     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: `chars`
[INFO] [stdout]   --> src/generics_and_traits.rs:59:9
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let chars = Point { x: 'a', y: 5 };
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `float`
[INFO] [stdout]   --> src/generics_and_traits.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |     let float = Point { x: 1.0, y: 4.0 };
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/generics_and_traits.rs:96:6
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn a(list: &i32) {
[INFO] [stdout]    |      ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/generics_and_traits.rs:99:6
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn b(list: &i8) {}
[INFO] [stdout]    |      ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/lifetimes.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/ownership.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let hello = &hw[..5];//same as 0..5
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/ownership.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let world = &hw[6..]; //same as 6..hw.len()
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `whole_string`
[INFO] [stdout]   --> src/ownership.rs:81:9
[INFO] [stdout]    |
[INFO] [stdout] 81 |     let whole_string = &hw[..]; //same as 0..hw.len()
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_whole_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `literal`
[INFO] [stdout]   --> src/ownership.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let literal = "i am literally a literal";
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_literal`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/ownership.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let slice = &a[1..3];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/smart_pointers.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structs.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     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: `origin`
[INFO] [stdout]   --> src/structs.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let origin = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest2`
[INFO] [stdout]   --> src/generics_and_traits.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn largest2<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `largest3`
[INFO] [stdout]   --> src/generics_and_traits.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn largest3<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_and_traits.rs:70:5
[INFO] [stdout]    |
[INFO] [stdout] 70 |     y: T,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `distance_from_origin`
[INFO] [stdout]   --> src/generics_and_traits.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/generics_and_traits.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     x: Wa,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/generics_and_traits.rs:93:5
[INFO] [stdout]    |
[INFO] [stdout] 93 |     y: Xwe,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `a`
[INFO] [stdout]   --> src/generics_and_traits.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn a(list: &i32) {
[INFO] [stdout]    |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `b`
[INFO] [stdout]   --> src/generics_and_traits.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn b(list: &i8) {}
[INFO] [stdout]    |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stdout]   --> src/lifetimes.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct ImportantExcerpt<'a> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]  --> src/structs.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     active: bool,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]    --> src/structs.rs:161:8
[INFO] [stdout]     |
[INFO] [stdout] 161 | struct Point(i32, i32, i32);
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 35 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.30s
[INFO] running `Command { std: "docker" "inspect" "c8dbd1d3f8a25f2864ec036bbcfa6d9006d13a3ea5d92d37ee7ab81cc574627b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8dbd1d3f8a25f2864ec036bbcfa6d9006d13a3ea5d92d37ee7ab81cc574627b", kill_on_drop: false }`
[INFO] [stdout] c8dbd1d3f8a25f2864ec036bbcfa6d9006d13a3ea5d92d37ee7ab81cc574627b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-40/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-40/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] 30abe4544057b391b734e3a14996cdbaaee66c09f750f9dac2fae2c1e7c13187
[INFO] running `Command { std: "docker" "start" "-a" "30abe4544057b391b734e3a14996cdbaaee66c09f750f9dac2fae2c1e7c13187", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused import: `rc::Rc`
[INFO] [stderr]    --> src/concurrency.rs:127:15
[INFO] [stderr]     |
[INFO] [stderr] 127 |     use std::{rc::Rc, sync::Arc};
[INFO] [stderr]     |               ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::env`
[INFO] [stderr]  --> src/miscellaneous.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::env;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process::exit`
[INFO] [stderr]  --> src/miscellaneous.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::process::exit;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: irrefutable `if let` pattern
[INFO] [stderr]   --> src/patterns.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 |     if let x = 5 {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stderr]    = note: this pattern will always match, so the `if let` is useless
[INFO] [stderr]    = help: consider replacing the `if let` with a `let`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v2`
[INFO] [stderr]  --> src/collections.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let v2 = vec![1, 2, 3];
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `non_existent2`
[INFO] [stderr]   --> src/collections.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |     let non_existent2 = v3.get(100);
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_non_existent2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `empty_string`
[INFO] [stderr]   --> src/collections.rs:89:9
[INFO] [stderr]    |
[INFO] [stderr] 89 |     let empty_string = String::new();
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_empty_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string1`
[INFO] [stderr]   --> src/collections.rs:91:9
[INFO] [stderr]    |
[INFO] [stderr] 91 |     let string1 = "hello".to_string();
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `string2`
[INFO] [stderr]   --> src/collections.rs:93:9
[INFO] [stderr]    |
[INFO] [stderr] 93 |     let string2 = String::from("hello");
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_string2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `non_ascii_string`
[INFO] [stderr]   --> src/collections.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |     let non_ascii_string = String::from("안녕하세요");
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_non_ascii_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s3`
[INFO] [stderr]    --> src/collections.rs:102:9
[INFO] [stderr]     |
[INFO] [stderr] 102 |     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: `chars`
[INFO] [stderr]   --> src/generics_and_traits.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |     let chars = Point { x: 'a', y: 5 };
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_chars`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `float`
[INFO] [stderr]   --> src/generics_and_traits.rs:60:9
[INFO] [stderr]    |
[INFO] [stderr] 60 |     let float = Point { x: 1.0, y: 4.0 };
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_float`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list`
[INFO] [stderr]   --> src/generics_and_traits.rs:96:6
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn a(list: &i32) {
[INFO] [stderr]    |      ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list`
[INFO] [stderr]   --> src/generics_and_traits.rs:99:6
[INFO] [stderr]    |
[INFO] [stderr] 99 | fn b(list: &i8) {}
[INFO] [stderr]    |      ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/lifetimes.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let s: &'static str = "I have a static lifetime.";
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]   --> src/ownership.rs:79:9
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let hello = &hw[..5];//same as 0..5
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/ownership.rs:80:9
[INFO] [stderr]    |
[INFO] [stderr] 80 |     let world = &hw[6..]; //same as 6..hw.len()
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `whole_string`
[INFO] [stderr]   --> src/ownership.rs:81:9
[INFO] [stderr]    |
[INFO] [stderr] 81 |     let whole_string = &hw[..]; //same as 0..hw.len()
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_whole_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `literal`
[INFO] [stderr]   --> src/ownership.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 86 |     let literal = "i am literally a literal";
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_literal`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> src/ownership.rs:93:9
[INFO] [stderr]    |
[INFO] [stderr] 93 |     let slice = &a[1..3];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `list`
[INFO] [stderr]   --> src/smart_pointers.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `black`
[INFO] [stderr]   --> src/structs.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     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: `origin`
[INFO] [stderr]   --> src/structs.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let origin = Color(0, 0, 0);
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest2`
[INFO] [stderr]   --> src/generics_and_traits.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn largest2<T: PartialOrd>(list: &[T]) -> &T {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `largest3`
[INFO] [stdout] 
[INFO] [stderr]   --> src/generics_and_traits.rs:31:4
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr] 31 | fn largest3<T: PartialOrd + Copy>(list: &[T]) -> T {
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/generics_and_traits.rs:70:5
[INFO] [stderr]    |
[INFO] [stderr] 70 |     y: T,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `distance_from_origin`
[INFO] [stderr]   --> src/generics_and_traits.rs:82:8
[INFO] [stderr]    |
[INFO] [stderr] 82 |     fn distance_from_origin(&self) -> f32 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `x`
[INFO] [stderr]   --> src/generics_and_traits.rs:92:5
[INFO] [stderr]    |
[INFO] [stderr] 92 |     x: Wa,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/generics_and_traits.rs:93:5
[INFO] [stderr]    |
[INFO] [stderr] 93 |     y: Xwe,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `a`
[INFO] [stderr]   --> src/generics_and_traits.rs:96:4
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn a(list: &i32) {
[INFO] [stderr]    |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `b`
[INFO] [stderr]   --> src/generics_and_traits.rs:99:4
[INFO] [stderr]    |
[INFO] [stderr] 99 | fn b(list: &i8) {}
[INFO] [stderr]    |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt`
[INFO] [stderr]   --> src/lifetimes.rs:48:8
[INFO] [stderr]    |
[INFO] [stderr] 48 | struct ImportantExcerpt<'a> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]  --> src/structs.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     active: bool,
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]    --> src/structs.rs:161:8
[INFO] [stderr]     |
[INFO] [stderr] 161 | struct Point(i32, i32, i32);
[INFO] [stderr]     |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `hello-rust` (bin "hello-rust" test) generated 35 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.47s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/hello_rust-ef30b742cf14acfa)
[INFO] running `Command { std: "docker" "inspect" "30abe4544057b391b734e3a14996cdbaaee66c09f750f9dac2fae2c1e7c13187", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30abe4544057b391b734e3a14996cdbaaee66c09f750f9dac2fae2c1e7c13187", kill_on_drop: false }`
[INFO] [stdout] 30abe4544057b391b734e3a14996cdbaaee66c09f750f9dac2fae2c1e7c13187