[INFO] cloning repository https://github.com/inblack67/Rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/inblack67/Rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finblack67%2FRust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finblack67%2FRust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 37146a31e78cae8dfb5c7cfad503a141f13deab8
[INFO] testing inblack67/Rust against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finblack67%2FRust" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/inblack67/Rust on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/inblack67/Rust
[INFO] finished tweaking git repo https://github.com/inblack67/Rust
[INFO] tweaked toml for git repo https://github.com/inblack67/Rust written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/inblack67/Rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 70272efb72f6b740f1d1717c8441e5ff55c7e286017f01a593651a797cda8612
[INFO] running `Command { std: "docker" "start" "-a" "70272efb72f6b740f1d1717c8441e5ff55c7e286017f01a593651a797cda8612", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "70272efb72f6b740f1d1717c8441e5ff55c7e286017f01a593651a797cda8612", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70272efb72f6b740f1d1717c8441e5ff55c7e286017f01a593651a797cda8612", kill_on_drop: false }`
[INFO] [stdout] 70272efb72f6b740f1d1717c8441e5ff55c7e286017f01a593651a797cda8612
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 21a6af057067d017acfcee5297491b5d2f462715da51e4e386b3c02c5695d742
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "21a6af057067d017acfcee5297491b5d2f462715da51e4e386b3c02c5695d742", kill_on_drop: false }`
[INFO] [stderr]    Compiling Rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> src/error_handling.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let f = match f {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let f = File::open("text.txt").unwrap(); // unwraps to data
[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/error_handling.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let f = File::open("text.txt").expect("Could not open file"); // unwraps to data or panics with the provided error
[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/generics.rs:28:6
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let s = Square { x: 1 };
[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/generics.rs:29:6
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let s = Square { x: "hello" };
[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/generics.rs:30:6
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let s = Square { x: true };
[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/lifetimes.rs:20:6
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let s: &'static str = "static life"; // will live until the entire duration of the program
[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/vectors.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let x: Vec<i32> = vec![1, 2, 3]; // resizable array => length not known at compile time
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/enums.rs:10:2
[INFO] [stdout]    |
[INFO] [stdout] 10 |     x: 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: `y`
[INFO] [stdout]   --> src/enums.rs:11:2
[INFO] [stdout]    |
[INFO] [stdout] 11 |     y: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `DOWN`
[INFO] [stdout]   --> src/enums.rs:16:2
[INFO] [stdout]    |
[INFO] [stdout] 16 |     DOWN(Point),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `LEFT`
[INFO] [stdout]   --> src/enums.rs:17:2
[INFO] [stdout]    |
[INFO] [stdout] 17 |     LEFT(Point),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `RIGHT`
[INFO] [stdout]   --> src/enums.rs:18:2
[INFO] [stdout]    |
[INFO] [stdout] 18 |     RIGHT(Point),
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `DownKey`
[INFO] [stdout]   --> src/enums.rs:24:2
[INFO] [stdout]    |
[INFO] [stdout] 24 |     DownKey(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/enums.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[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: variant is never constructed: `LeftKey`
[INFO] [stdout]   --> src/enums.rs:25:2
[INFO] [stdout]    |
[INFO] [stdout] 25 |     LeftKey(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/enums.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[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: variant is never constructed: `RightKey`
[INFO] [stdout]   --> src/enums.rs:26:2
[INFO] [stdout]    |
[INFO] [stdout] 26 |     RightKey(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/enums.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[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: function is never used: `play_with_files`
[INFO] [stdout]  --> src/error_handling.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn play_with_files() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `play_with_files_2`
[INFO] [stdout]   --> src/error_handling.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn play_with_files_2() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `exit`
[INFO] [stdout]   --> src/error_handling.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn exit(x: Option<i32>) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `p`
[INFO] [stdout]  --> src/generics.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn p<T: fmt::Debug>(x: T) {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]  --> src/generics.rs:9:2
[INFO] [stdout]   |
[INFO] [stdout] 9 |     x: T,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `A`
[INFO] [stdout]   --> src/generics.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct A<T> {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `item`
[INFO] [stdout]   --> src/generics.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn item(&self) -> &T {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `M`
[INFO] [stdout]   --> src/generics.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct M<U, V> {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `pr`
[INFO] [stdout]  --> src/lifetimes.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn pr<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `A`
[INFO] [stdout]   --> src/lifetimes.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct A<'a, 'b> {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `NUM_TIMERS`
[INFO] [stdout]  --> src/mpsc.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | const NUM_TIMERS: usize = 24; // usize => architechture dependent => 32bit or 64bit
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `timer`
[INFO] [stdout]  --> src/mpsc.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn timer(d: usize, tx: mpsc::Sender<usize>) {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/mpsc.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `MyOption`
[INFO] [stdout]  --> src/options.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum MyOption<T> {
[INFO] [stdout]   |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]  --> src/result_enum.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Result<T, E> {
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.59s
[INFO] running `Command { std: "docker" "inspect" "21a6af057067d017acfcee5297491b5d2f462715da51e4e386b3c02c5695d742", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21a6af057067d017acfcee5297491b5d2f462715da51e4e386b3c02c5695d742", kill_on_drop: false }`
[INFO] [stdout] 21a6af057067d017acfcee5297491b5d2f462715da51e4e386b3c02c5695d742
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0c47d7c3ceb9bb454a3b5298e84c158c03f5ba696ba7734ac0899a6f56656a0f
[INFO] running `Command { std: "docker" "start" "-a" "0c47d7c3ceb9bb454a3b5298e84c158c03f5ba696ba7734ac0899a6f56656a0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling Rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> src/error_handling.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let f = match f {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/error_handling.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let f = File::open("text.txt").unwrap(); // unwraps to data
[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/error_handling.rs:24:6
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let f = File::open("text.txt").expect("Could not open file"); // unwraps to data or panics with the provided error
[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/generics.rs:28:6
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let s = Square { x: 1 };
[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/generics.rs:29:6
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let s = Square { x: "hello" };
[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/generics.rs:30:6
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let s = Square { x: true };
[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/lifetimes.rs:20:6
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let s: &'static str = "static life"; // will live until the entire duration of the program
[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/vectors.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let x: Vec<i32> = vec![1, 2, 3]; // resizable array => length not known at compile time
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]   --> src/enums.rs:10:2
[INFO] [stdout]    |
[INFO] [stdout] 10 |     x: 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: `y`
[INFO] [stdout]   --> src/enums.rs:11:2
[INFO] [stdout]    |
[INFO] [stdout] 11 |     y: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `DOWN`
[INFO] [stdout]   --> src/enums.rs:16:2
[INFO] [stdout]    |
[INFO] [stdout] 16 |     DOWN(Point),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `LEFT`
[INFO] [stdout]   --> src/enums.rs:17:2
[INFO] [stdout]    |
[INFO] [stdout] 17 |     LEFT(Point),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `RIGHT`
[INFO] [stdout]   --> src/enums.rs:18:2
[INFO] [stdout]    |
[INFO] [stdout] 18 |     RIGHT(Point),
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `DownKey`
[INFO] [stdout]   --> src/enums.rs:24:2
[INFO] [stdout]    |
[INFO] [stdout] 24 |     DownKey(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/enums.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[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: variant is never constructed: `LeftKey`
[INFO] [stdout]   --> src/enums.rs:25:2
[INFO] [stdout]    |
[INFO] [stdout] 25 |     LeftKey(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/enums.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[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: variant is never constructed: `RightKey`
[INFO] [stdout]   --> src/enums.rs:26:2
[INFO] [stdout]    |
[INFO] [stdout] 26 |     RightKey(String),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/enums.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | #[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: function is never used: `play_with_files`
[INFO] [stdout]  --> src/error_handling.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn play_with_files() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `play_with_files_2`
[INFO] [stdout]   --> src/error_handling.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn play_with_files_2() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `exit`
[INFO] [stdout]   --> src/error_handling.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn exit(x: Option<i32>) {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `p`
[INFO] [stdout]  --> src/generics.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn p<T: fmt::Debug>(x: T) {
[INFO] [stdout]   |    ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]  --> src/generics.rs:9:2
[INFO] [stdout]   |
[INFO] [stdout] 9 |     x: T,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `A`
[INFO] [stdout]   --> src/generics.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct A<T> {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `item`
[INFO] [stdout]   --> src/generics.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn item(&self) -> &T {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `M`
[INFO] [stdout]   --> src/generics.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 | struct M<U, V> {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `pr`
[INFO] [stdout]  --> src/lifetimes.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn pr<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]   |    ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `A`
[INFO] [stdout]   --> src/lifetimes.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct A<'a, 'b> {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `NUM_TIMERS`
[INFO] [stdout]  --> src/mpsc.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | const NUM_TIMERS: usize = 24; // usize => architechture dependent => 32bit or 64bit
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `timer`
[INFO] [stdout]  --> src/mpsc.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn timer(d: usize, tx: mpsc::Sender<usize>) {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]   --> src/mpsc.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `MyOption`
[INFO] [stdout]  --> src/options.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum MyOption<T> {
[INFO] [stdout]   |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Result`
[INFO] [stdout]  --> src/result_enum.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Result<T, E> {
[INFO] [stdout]   |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 31 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.19s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/Rust-f456ae2b2b2df572)
[INFO] running `Command { std: "docker" "inspect" "0c47d7c3ceb9bb454a3b5298e84c158c03f5ba696ba7734ac0899a6f56656a0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c47d7c3ceb9bb454a3b5298e84c158c03f5ba696ba7734ac0899a6f56656a0f", kill_on_drop: false }`
[INFO] [stdout] 0c47d7c3ceb9bb454a3b5298e84c158c03f5ba696ba7734ac0899a6f56656a0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1a0688dc4a7bf4fdc3cd144e862698a4377ba03b89776941e682bbed0d006a44
[INFO] running `Command { std: "docker" "start" "-a" "1a0688dc4a7bf4fdc3cd144e862698a4377ba03b89776941e682bbed0d006a44", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stdout] 
[INFO] [stderr]  --> src/error_handling.rs:8:6
[INFO] [stdout] running 0 tests
[INFO] [stderr]   |
[INFO] [stdout] 
[INFO] [stderr] 8 |     let f = match f {
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/error_handling.rs:23:6
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let f = File::open("text.txt").unwrap(); // unwraps to data
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/error_handling.rs:24:6
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let f = File::open("text.txt").expect("Could not open file"); // unwraps to data or panics with the provided error
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/generics.rs:28:6
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let s = Square { x: 1 };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/generics.rs:29:6
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let s = Square { x: "hello" };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/generics.rs:30:6
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let s = Square { x: true };
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/lifetimes.rs:20:6
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let s: &'static str = "static life"; // will live until the entire duration of the program
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/vectors.rs:10:6
[INFO] [stderr]    |
[INFO] [stderr] 10 |     let x: Vec<i32> = vec![1, 2, 3]; // resizable array => length not known at compile time
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `x`
[INFO] [stderr]   --> src/enums.rs:10:2
[INFO] [stderr]    |
[INFO] [stderr] 10 |     x: u32,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `y`
[INFO] [stderr]   --> src/enums.rs:11:2
[INFO] [stderr]    |
[INFO] [stderr] 11 |     y: u32,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `DOWN`
[INFO] [stderr]   --> src/enums.rs:16:2
[INFO] [stderr]    |
[INFO] [stderr] 16 |     DOWN(Point),
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `LEFT`
[INFO] [stderr]   --> src/enums.rs:17:2
[INFO] [stderr]    |
[INFO] [stderr] 17 |     LEFT(Point),
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RIGHT`
[INFO] [stderr]   --> src/enums.rs:18:2
[INFO] [stderr]    |
[INFO] [stderr] 18 |     RIGHT(Point),
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `DownKey`
[INFO] [stderr]   --> src/enums.rs:24:2
[INFO] [stderr]    |
[INFO] [stderr] 24 |     DownKey(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/enums.rs:21:10
[INFO] [stderr]    |
[INFO] [stderr] 21 | #[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: variant is never constructed: `LeftKey`
[INFO] [stderr]   --> src/enums.rs:25:2
[INFO] [stderr]    |
[INFO] [stderr] 25 |     LeftKey(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/enums.rs:21:10
[INFO] [stderr]    |
[INFO] [stderr] 21 | #[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: variant is never constructed: `RightKey`
[INFO] [stderr]   --> src/enums.rs:26:2
[INFO] [stderr]    |
[INFO] [stderr] 26 |     RightKey(String),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `Keys` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/enums.rs:21:10
[INFO] [stderr]    |
[INFO] [stderr] 21 | #[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: function is never used: `play_with_files`
[INFO] [stderr]  --> src/error_handling.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn play_with_files() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `play_with_files_2`
[INFO] [stderr]   --> src/error_handling.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn play_with_files_2() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `exit`
[INFO] [stderr]   --> src/error_handling.rs:27:4
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn exit(x: Option<i32>) {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `p`
[INFO] [stderr]  --> src/generics.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn p<T: fmt::Debug>(x: T) {
[INFO] [stderr]   |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `x`
[INFO] [stderr]  --> src/generics.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     x: T,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `A`
[INFO] [stderr]   --> src/generics.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 | struct A<T> {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `item`
[INFO] [stderr]   --> src/generics.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn item(&self) -> &T {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `M`
[INFO] [stderr]   --> src/generics.rs:22:8
[INFO] [stderr]    |
[INFO] [stderr] 22 | struct M<U, V> {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `pr`
[INFO] [stderr]  --> src/lifetimes.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn pr<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]   |    ^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `A`
[INFO] [stderr]   --> src/lifetimes.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 | struct A<'a, 'b> {
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `NUM_TIMERS`
[INFO] [stderr]  --> src/mpsc.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | const NUM_TIMERS: usize = 24; // usize => architechture dependent => 32bit or 64bit
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `timer`
[INFO] [stderr]  --> src/mpsc.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn timer(d: usize, tx: mpsc::Sender<usize>) {
[INFO] [stderr]   |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]   --> src/mpsc.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn run() {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `MyOption`
[INFO] [stderr]  --> src/options.rs:4:6
[INFO] [stderr]   |
[INFO] [stderr] 4 | enum MyOption<T> {
[INFO] [stderr]   |      ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Result`
[INFO] [stderr]  --> src/result_enum.rs:4:6
[INFO] [stderr]   |
[INFO] [stderr] 4 | enum Result<T, E> {
[INFO] [stderr]   |      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `Rust` (bin "Rust" test) generated 31 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/Rust-f456ae2b2b2df572)
[INFO] running `Command { std: "docker" "inspect" "1a0688dc4a7bf4fdc3cd144e862698a4377ba03b89776941e682bbed0d006a44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a0688dc4a7bf4fdc3cd144e862698a4377ba03b89776941e682bbed0d006a44", kill_on_drop: false }`
[INFO] [stdout] 1a0688dc4a7bf4fdc3cd144e862698a4377ba03b89776941e682bbed0d006a44