[INFO] cloning repository https://github.com/EqZotiQQQ/threads
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EqZotiQQQ/threads" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEqZotiQQQ%2Fthreads", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEqZotiQQQ%2Fthreads'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d1bc9c3d73ed01da959b7b1d087f2ffaf6c82ce0
[INFO] testing EqZotiQQQ/threads against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEqZotiQQQ%2Fthreads" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/EqZotiQQQ/threads 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/EqZotiQQQ/threads
[INFO] finished tweaking git repo https://github.com/EqZotiQQQ/threads
[INFO] tweaked toml for git repo https://github.com/EqZotiQQQ/threads written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/EqZotiQQQ/threads 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 num_cpus v0.2.13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] acfd5e5746fa62d02b1edb36d29ac6998b75db98a258c8ee6f73d5190b46a912
[INFO] running `Command { std: "docker" "start" "-a" "acfd5e5746fa62d02b1edb36d29ac6998b75db98a258c8ee6f73d5190b46a912", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "acfd5e5746fa62d02b1edb36d29ac6998b75db98a258c8ee6f73d5190b46a912", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "acfd5e5746fa62d02b1edb36d29ac6998b75db98a258c8ee6f73d5190b46a912", kill_on_drop: false }`
[INFO] [stdout] acfd5e5746fa62d02b1edb36d29ac6998b75db98a258c8ee6f73d5190b46a912
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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] 0060f38beb49b24cf48963d17e976807c940f0fa5c1ad3cc3761e8319cf9a9dc
[INFO] running `Command { std: "docker" "start" "-a" "0060f38beb49b24cf48963d17e976807c940f0fa5c1ad3cc3761e8319cf9a9dc", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling num_cpus v0.2.13
[INFO] [stderr]    Compiling threads v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::thread::JoinHandle`
[INFO] [stdout]  --> src/single_thread_executor.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/single_thread_executor.rs:98:13
[INFO] [stdout]    |
[INFO] [stdout] 98 |         let mut queue = Arc::clone(&self.queue);
[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: variant is never constructed: `NEW`
[INFO] [stdout]   --> src/single_thread_executor.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     NEW,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `RUNNING`
[INFO] [stdout]   --> src/single_thread_executor.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     RUNNING,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `NotStarted`
[INFO] [stdout]   --> src/single_thread_executor.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     NotStarted, // Invoked when you append functions while Executor didn't start yet
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `STOPPED`
[INFO] [stdout]   --> src/single_thread_executor.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     STOPPED,    // Invoked when you append functions while Executor Stopped
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `AlreadyRunning`
[INFO] [stdout]   --> src/single_thread_executor.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     AlreadyRunning, // Invoked when you tried to start Executor twice
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: associated function is never used: `new`
[INFO] [stdout]   --> src/single_thread_executor.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn new() -> Executor {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `start`
[INFO] [stdout]   --> src/single_thread_executor.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn start(&mut self) -> Result<(), CustomError>{
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/single_thread_executor.rs:78:12
[INFO] [stdout]    |
[INFO] [stdout] 78 |     pub fn append(&mut self, f: Box<dyn Fn() + Send + 'static>) -> Result<(), CustomError> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]   --> src/single_thread_executor.rs:59:29
[INFO] [stdout]    |
[INFO] [stdout] 59 | ...                   cv.wait(lock).unwrap();
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:101:13
[INFO] [stdout]     |
[INFO] [stdout] 101 |             self.cv.wait(lock).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 119 |         self.join(); // we invoke join to correctly finish the jobs
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::single_thread_executor::Executor`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::single_thread_executor::Executor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::JoinHandle`
[INFO] [stdout]  --> src/single_thread_executor.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/single_thread_executor.rs:98:13
[INFO] [stdout]    |
[INFO] [stdout] 98 |         let mut queue = Arc::clone(&self.queue);
[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: variant is never constructed: `NEW`
[INFO] [stdout]   --> src/single_thread_executor.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     NEW,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `RUNNING`
[INFO] [stdout]   --> src/single_thread_executor.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     RUNNING,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `NotStarted`
[INFO] [stdout]   --> src/single_thread_executor.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     NotStarted, // Invoked when you append functions while Executor didn't start yet
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `STOPPED`
[INFO] [stdout]   --> src/single_thread_executor.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     STOPPED,    // Invoked when you append functions while Executor Stopped
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `AlreadyRunning`
[INFO] [stdout]   --> src/single_thread_executor.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     AlreadyRunning, // Invoked when you tried to start Executor twice
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: associated function is never used: `new`
[INFO] [stdout]   --> src/single_thread_executor.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn new() -> Executor {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `start`
[INFO] [stdout]   --> src/single_thread_executor.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn start(&mut self) -> Result<(), CustomError>{
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/single_thread_executor.rs:78:12
[INFO] [stdout]    |
[INFO] [stdout] 78 |     pub fn append(&mut self, f: Box<dyn Fn() + Send + 'static>) -> Result<(), CustomError> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]   --> src/single_thread_executor.rs:59:29
[INFO] [stdout]    |
[INFO] [stdout] 59 | ...                   cv.wait(lock).unwrap();
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:101:13
[INFO] [stdout]     |
[INFO] [stdout] 101 |             self.cv.wait(lock).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 119 |         self.join(); // we invoke join to correctly finish the jobs
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.26s
[INFO] running `Command { std: "docker" "inspect" "0060f38beb49b24cf48963d17e976807c940f0fa5c1ad3cc3761e8319cf9a9dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0060f38beb49b24cf48963d17e976807c940f0fa5c1ad3cc3761e8319cf9a9dc", kill_on_drop: false }`
[INFO] [stdout] 0060f38beb49b24cf48963d17e976807c940f0fa5c1ad3cc3761e8319cf9a9dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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] 79c0cc5c6fb3e5d1c177ea11768879ede906ed20872ff5cc31043b2d377193c3
[INFO] running `Command { std: "docker" "start" "-a" "79c0cc5c6fb3e5d1c177ea11768879ede906ed20872ff5cc31043b2d377193c3", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `std::thread::JoinHandle`
[INFO] [stdout]  --> src/single_thread_executor.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/single_thread_executor.rs:98:13
[INFO] [stdout]    |
[INFO] [stdout] 98 |         let mut queue = Arc::clone(&self.queue);
[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: variant is never constructed: `NEW`
[INFO] [stdout]   --> src/single_thread_executor.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     NEW,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `RUNNING`
[INFO] [stdout]   --> src/single_thread_executor.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     RUNNING,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `NotStarted`
[INFO] [stdout]   --> src/single_thread_executor.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     NotStarted, // Invoked when you append functions while Executor didn't start yet
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `STOPPED`
[INFO] [stdout]   --> src/single_thread_executor.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     STOPPED,    // Invoked when you append functions while Executor Stopped
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `AlreadyRunning`
[INFO] [stdout]   --> src/single_thread_executor.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     AlreadyRunning, // Invoked when you tried to start Executor twice
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: associated function is never used: `new`
[INFO] [stdout]   --> src/single_thread_executor.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn new() -> Executor {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `start`
[INFO] [stdout]   --> src/single_thread_executor.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn start(&mut self) -> Result<(), CustomError>{
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/single_thread_executor.rs:78:12
[INFO] [stdout]    |
[INFO] [stdout] 78 |     pub fn append(&mut self, f: Box<dyn Fn() + Send + 'static>) -> Result<(), CustomError> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]   --> src/single_thread_executor.rs:59:29
[INFO] [stdout]    |
[INFO] [stdout] 59 | ...                   cv.wait(lock).unwrap();
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:101:13
[INFO] [stdout]     |
[INFO] [stdout] 101 |             self.cv.wait(lock).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling threads v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 119 |         self.join(); // we invoke join to correctly finish the jobs
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::sleep`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::thread::sleep;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::single_thread_executor::Executor`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::single_thread_executor::Executor;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::JoinHandle`
[INFO] [stdout]  --> src/single_thread_executor.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::JoinHandle`
[INFO] [stdout]  --> src/single_thread_executor.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::thread::JoinHandle;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/single_thread_executor.rs:98:13
[INFO] [stdout]    |
[INFO] [stdout] 98 |         let mut queue = Arc::clone(&self.queue);
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/single_thread_executor.rs:98:13
[INFO] [stdout]    |
[INFO] [stdout] 98 |         let mut queue = Arc::clone(&self.queue);
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/single_thread_executor_tests.rs:10:13
[INFO] [stdout]    |
[INFO] [stdout] 10 |         let mut f = || -> () {println!("Hello!")};
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `NEW`
[INFO] [stdout]   --> src/single_thread_executor.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     NEW,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `RUNNING`
[INFO] [stdout]   --> src/single_thread_executor.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     RUNNING,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `RUNNING`
[INFO] [stdout]   --> src/single_thread_executor.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     RUNNING,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `NotStarted`
[INFO] [stdout]   --> src/single_thread_executor.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     NotStarted, // Invoked when you append functions while Executor didn't start yet
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `AlreadyRunning`
[INFO] [stdout]   --> src/single_thread_executor.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     AlreadyRunning, // Invoked when you tried to start Executor twice
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: associated function is never used: `start`
[INFO] [stdout]   --> src/single_thread_executor.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn start(&mut self) -> Result<(), CustomError>{
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `STOPPED`
[INFO] [stdout]   --> src/single_thread_executor.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     STOPPED,    // Invoked when you append functions while Executor Stopped
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `AlreadyRunning`
[INFO] [stdout]   --> src/single_thread_executor.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     AlreadyRunning, // Invoked when you tried to start Executor twice
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/single_thread_executor.rs:15:10
[INFO] [stdout]    |
[INFO] [stdout] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: associated function is never used: `new`
[INFO] [stdout]   --> src/single_thread_executor.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 34 |     pub fn new() -> Executor {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `start`
[INFO] [stdout]   --> src/single_thread_executor.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn start(&mut self) -> Result<(), CustomError>{
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]   --> src/single_thread_executor.rs:78:12
[INFO] [stdout]    |
[INFO] [stdout] 78 |     pub fn append(&mut self, f: Box<dyn Fn() + Send + 'static>) -> Result<(), CustomError> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]   --> src/single_thread_executor.rs:59:29
[INFO] [stdout]    |
[INFO] [stdout] 59 | ...                   cv.wait(lock).unwrap();
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]   --> src/single_thread_executor.rs:59:29
[INFO] [stdout]    |
[INFO] [stdout] 59 | ...                   cv.wait(lock).unwrap();
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:101:13
[INFO] [stdout]     |
[INFO] [stdout] 101 |             self.cv.wait(lock).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 119 |         self.join(); // we invoke join to correctly finish the jobs
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/single_thread_executor_tests.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         executor.append(Box::new(f));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:101:13
[INFO] [stdout]     |
[INFO] [stdout] 101 |             self.cv.wait(lock).unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if unused the Mutex will immediately unlock
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/single_thread_executor.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 119 |         self.join(); // we invoke join to correctly finish the jobs
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "79c0cc5c6fb3e5d1c177ea11768879ede906ed20872ff5cc31043b2d377193c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79c0cc5c6fb3e5d1c177ea11768879ede906ed20872ff5cc31043b2d377193c3", kill_on_drop: false }`
[INFO] [stdout] 79c0cc5c6fb3e5d1c177ea11768879ede906ed20872ff5cc31043b2d377193c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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] fd9fc6465fa424578e814d8d37b694bcc85a3cc530a923a851481ec549ac3cd1
[INFO] running `Command { std: "docker" "start" "-a" "fd9fc6465fa424578e814d8d37b694bcc85a3cc530a923a851481ec549ac3cd1", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::thread::JoinHandle`
[INFO] [stderr]  --> src/single_thread_executor.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::thread::JoinHandle;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/single_thread_executor.rs:98:13
[INFO] [stderr]    |
[INFO] [stderr] 98 |         let mut queue = Arc::clone(&self.queue);
[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: variant is never constructed: `NEW`
[INFO] [stderr]   --> src/single_thread_executor.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     NEW,
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/single_thread_executor.rs:8:10
[INFO] [stderr]    |
[INFO] [stderr] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `RUNNING`
[INFO] [stderr]   --> src/single_thread_executor.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     RUNNING,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/single_thread_executor.rs:8:10
[INFO] [stderr]    |
[INFO] [stderr] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `NotStarted`
[INFO] [stderr]   --> src/single_thread_executor.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     NotStarted, // Invoked when you append functions while Executor didn't start yet
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/single_thread_executor.rs:15:10
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `STOPPED`
[INFO] [stderr]   --> src/single_thread_executor.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     STOPPED,    // Invoked when you append functions while Executor Stopped
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/single_thread_executor.rs:15:10
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: `AlreadyRunning`
[INFO] [stderr]   --> src/single_thread_executor.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     AlreadyRunning, // Invoked when you tried to start Executor twice
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `CustomError` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/single_thread_executor.rs:15:10
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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: associated function is never used: `new`
[INFO] [stderr]   --> src/single_thread_executor.rs:34:12
[INFO] [stderr]    |
[INFO] [stderr] 34 |     pub fn new() -> Executor {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `start`
[INFO] [stderr]   --> src/single_thread_executor.rs:45:12
[INFO] [stderr]    |
[INFO] [stderr] 45 |     pub fn start(&mut self) -> Result<(), CustomError>{
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `append`
[INFO] [stderr]   --> src/single_thread_executor.rs:78:12
[INFO] [stderr]    |
[INFO] [stderr] 78 |     pub fn append(&mut self, f: Box<dyn Fn() + Send + 'static>) -> Result<(), CustomError> {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `MutexGuard` that must be used
[INFO] [stderr]   --> src/single_thread_executor.rs:59:29
[INFO] [stderr]    |
[INFO] [stderr] 59 | ...                   cv.wait(lock).unwrap();
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: if unused the Mutex will immediately unlock
[INFO] [stderr] 
[INFO] [stderr] warning: unused `MutexGuard` that must be used
[INFO] [stderr]    --> src/single_thread_executor.rs:101:13
[INFO] [stderr]     |
[INFO] [stderr] 101 |             self.cv.wait(lock).unwrap();
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if unused the Mutex will immediately unlock
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/single_thread_executor.rs:119:9
[INFO] [stderr]     |
[INFO] [stderr] 119 |         self.join(); // we invoke join to correctly finish the jobs
[INFO] [stderr]     |         ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `threads` (lib) generated 13 warnings
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/single_thread_executor_tests.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |         let mut f = || -> () {println!("Hello!")};
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `RUNNING`
[INFO] [stderr]   --> src/single_thread_executor.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     RUNNING,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] note: `State` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/single_thread_executor.rs:8:10
[INFO] [stderr]    |
[INFO] [stderr] 8  | #[derive(Debug, Clone, Copy, Eq, PartialEq)]
[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 `Result` that must be used
[INFO] [stderr]   --> src/single_thread_executor_tests.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |         executor.append(Box::new(f));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `threads` (lib test) generated 10 warnings (7 duplicates)
[INFO] [stderr] warning: unused import: `std::thread::sleep`
[INFO] [stderr]  --> src/main.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::thread::sleep;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]  --> src/main.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::time::Duration;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::single_thread_executor::Executor`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use crate::single_thread_executor::Executor;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread::JoinHandle`
[INFO] [stderr]  --> src/single_thread_executor.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::thread::JoinHandle;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `threads` (bin "threads" test) generated 16 warnings (12 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/threads-dcb7749422074199)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test single_thread_executor_tests::tests::create_executor ... ok
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/threads-906efcbdb4327be3)
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]    Doc-tests threads
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[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] running `Command { std: "docker" "inspect" "fd9fc6465fa424578e814d8d37b694bcc85a3cc530a923a851481ec549ac3cd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd9fc6465fa424578e814d8d37b694bcc85a3cc530a923a851481ec549ac3cd1", kill_on_drop: false }`
[INFO] [stdout] fd9fc6465fa424578e814d8d37b694bcc85a3cc530a923a851481ec549ac3cd1