[INFO] fetching crate event-emitter-rs 0.1.4...
[INFO] testing event-emitter-rs-0.1.4 against master#99e3aef02079e9c10583638520cd0c134dc3a01d for pr-85530
[INFO] extracting crate event-emitter-rs 0.1.4 into /workspace/builds/worker-15/source
[INFO] validating manifest of crates.io crate event-emitter-rs 0.1.4 on toolchain 99e3aef02079e9c10583638520cd0c134dc3a01d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate event-emitter-rs 0.1.4
[INFO] finished tweaking crates.io crate event-emitter-rs 0.1.4
[INFO] tweaked toml for crates.io crate event-emitter-rs 0.1.4 written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e13d822e3d51c208aa88b896eb270da99f0bc86f636c6209b6b456e71de7ee85
[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" "e13d822e3d51c208aa88b896eb270da99f0bc86f636c6209b6b456e71de7ee85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e13d822e3d51c208aa88b896eb270da99f0bc86f636c6209b6b456e71de7ee85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e13d822e3d51c208aa88b896eb270da99f0bc86f636c6209b6b456e71de7ee85", kill_on_drop: false }`
[INFO] [stdout] e13d822e3d51c208aa88b896eb270da99f0bc86f636c6209b6b456e71de7ee85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ae8054728e88fa6257a5831a56f9e2dd3622569d9339dcb9332b1262f224e119
[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" "ae8054728e88fa6257a5831a56f9e2dd3622569d9339dcb9332b1262f224e119", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling bincode v1.3.3
[INFO] [stderr]    Compiling event-emitter-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::EventEmitter`
[INFO] [stdout]  --> src/tests.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::EventEmitter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]  --> src/tests.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |             ^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`
[INFO] [stdout]  --> src/tests.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::{Mutex, Arc};
[INFO] [stdout]   |                 ^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `event`
[INFO] [stdout]    --> src/lib.rs:331:32
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/lib.rs:331:45
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 16.75s
[INFO] running `Command { std: "docker" "inspect" "ae8054728e88fa6257a5831a56f9e2dd3622569d9339dcb9332b1262f224e119", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae8054728e88fa6257a5831a56f9e2dd3622569d9339dcb9332b1262f224e119", kill_on_drop: false }`
[INFO] [stdout] ae8054728e88fa6257a5831a56f9e2dd3622569d9339dcb9332b1262f224e119
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0aa474b5aef42ded6b14ffff5765c8bdf5517b4ec5b19130063b6589dbda0bfd
[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" "0aa474b5aef42ded6b14ffff5765c8bdf5517b4ec5b19130063b6589dbda0bfd", kill_on_drop: false }`
[INFO] [stderr]    Compiling event-emitter-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::EventEmitter`
[INFO] [stdout]  --> src/tests.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::EventEmitter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]  --> src/tests.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |             ^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Arc`, `Mutex`
[INFO] [stdout]  --> src/tests.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::{Mutex, Arc};
[INFO] [stdout]   |                 ^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `event`
[INFO] [stdout]    --> src/lib.rs:331:32
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/lib.rs:331:45
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stdout]  --> src/tests.rs:2:13
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |             ^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `event`
[INFO] [stdout]    --> src/lib.rs:331:32
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/lib.rs:331:45
[INFO] [stdout]     |
[INFO] [stdout] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stdout]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/tests.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut counter: Arc<Mutex<u32>> = Arc::new(Mutex::new(5));
[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/tests.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut container: Arc<Mutex<Container>> = Arc::new(Mutex::new(Container { list: Vec::new() }));
[INFO] [stdout]    |         ----^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/tests.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let mut counter: Arc<Mutex<u32>> = Arc::new(Mutex::new(5));
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/tests.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         callback.join();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/tests.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |         callback.join();
[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: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.15s
[INFO] running `Command { std: "docker" "inspect" "0aa474b5aef42ded6b14ffff5765c8bdf5517b4ec5b19130063b6589dbda0bfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0aa474b5aef42ded6b14ffff5765c8bdf5517b4ec5b19130063b6589dbda0bfd", kill_on_drop: false }`
[INFO] [stdout] 0aa474b5aef42ded6b14ffff5765c8bdf5517b4ec5b19130063b6589dbda0bfd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] fd71f899ad9d08c7cf397e94a6a709a5e1daed764e443e3683819df3a1d83a5c
[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" "fd71f899ad9d08c7cf397e94a6a709a5e1daed764e443e3683819df3a1d83a5c", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `crate::EventEmitter`
[INFO] [stderr]  --> src/tests.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use crate::EventEmitter;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stderr]  --> src/tests.rs:2:13
[INFO] [stderr]   |
[INFO] [stderr] 2 | use serde::{Deserialize, Serialize};
[INFO] [stderr]   |             ^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Arc`, `Mutex`
[INFO] [stderr]  --> src/tests.rs:3:17
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::sync::{Mutex, Arc};
[INFO] [stderr]   |                 ^^^^^  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `event`
[INFO] [stderr]    --> src/lib.rs:331:32
[INFO] [stderr]     |
[INFO] [stderr] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stderr]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:331:45
[INFO] [stderr]     |
[INFO] [stderr] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stderr]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Deserialize`, `Serialize`
[INFO] [stderr]  --> src/tests.rs:2:13
[INFO] [stderr]   |
[INFO] [stderr] 2 | use serde::{Deserialize, Serialize};
[INFO] [stderr]   |             ^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `event`
[INFO] [stderr]    --> src/lib.rs:331:32
[INFO] [stderr]     |
[INFO] [stderr] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stderr]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `value`
[INFO] [stderr]    --> src/lib.rs:331:45
[INFO] [stderr]     |
[INFO] [stderr] 331 |     pub fn sync_emit<T>(&self, event: &str, value: T) 
[INFO] [stderr]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/tests.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let mut counter: Arc<Mutex<u32>> = Arc::new(Mutex::new(5));
[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: variable does not need to be mutable
[INFO] [stderr]   --> src/tests.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let mut container: Arc<Mutex<Container>> = Arc::new(Mutex::new(Container { list: Vec::new() }));
[INFO] [stderr]    |         ----^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/tests.rs:78:9
[INFO] [stderr]    |
[INFO] [stderr] 78 |     let mut counter: Arc<Mutex<u32>> = Arc::new(Mutex::new(5));
[INFO] [stderr]    |         ----^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/tests.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |         callback.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/tests.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |         callback.join();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/event_emitter_rs-1724d52fe9644ad8)
[INFO] [stdout] running 5 tests
[INFO] [stdout] test tests::once ... ok
[INFO] [stdout] test tests::on_limited ... ok
[INFO] [stdout] test tests::global_emitter ... ok
[INFO] [stdout] test tests::remove_listener ... ok
[INFO] [stdout] test tests::on ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests event-emitter-rs
[INFO] [stdout] 
[INFO] [stdout] running 12 tests
[INFO] [stdout] test src/lib.rs - (line 102) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 71) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 85) ... FAILED
[INFO] [stdout] test src/lib.rs - EventEmitter::emit (line 175) ... ok
[INFO] [stdout] test src/lib.rs - (line 10) ... ok
[INFO] [stdout] test src/lib.rs - EventEmitter::remove_listener (line 228) ... ok
[INFO] [stdout] test src/lib.rs - (line 55) ... ok
[INFO] [stdout] test src/lib.rs - EventEmitter::on_limited (line 252) ... ok
[INFO] [stdout] test src/lib.rs - EventEmitter::once (line 293) ... ok
[INFO] [stdout] test src/lib.rs - EventEmitter::sync_emit (line 319) ... ok
[INFO] [stdout] test src/lib.rs - EventEmitter::on (line 153) ... ok
[INFO] [stdout] test src/lib.rs - (line 25) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 102) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `crate::global_event_emitter`
[INFO] [stdout]  --> src/lib.rs:104:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::global_event_emitter::EVENT_EMITTER;
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^ could not find `global_event_emitter` in the crate root
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 71) stdout ----
[INFO] [stdout] error[E0432]: unresolved import `crate::EventEmitter`
[INFO] [stdout]  --> src/lib.rs:74:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::EventEmitter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^ no `EventEmitter` in the root
[INFO] [stdout] 
[INFO] [stdout] error: cannot find macro `lazy_static` in this scope
[INFO] [stdout]  --> src/lib.rs:77:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | lazy_static! {
[INFO] [stdout]   | ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: consider importing this macro:
[INFO] [stdout]           lazy_static::lazy_static
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 85) stdout ----
[INFO] [stdout] error[E0583]: file not found for module `global_event_emitter`
[INFO] [stdout]  --> src/lib.rs:90:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | mod global_event_emitter;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: to create the module `global_event_emitter`, create file "src/global_event_emitter.rs" or "src/global_event_emitter/mod.rs"
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `global_event_emitter::EVENT_EMITTER`
[INFO] [stdout]  --> src/lib.rs:91:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use global_event_emitter::EVENT_EMITTER;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `EVENT_EMITTER` in `global_event_emitter`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0583.
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 102)
[INFO] [stdout]     src/lib.rs - (line 71)
[INFO] [stdout]     src/lib.rs - (line 85)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 9 passed; 3 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.51s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "fd71f899ad9d08c7cf397e94a6a709a5e1daed764e443e3683819df3a1d83a5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd71f899ad9d08c7cf397e94a6a709a5e1daed764e443e3683819df3a1d83a5c", kill_on_drop: false }`
[INFO] [stdout] fd71f899ad9d08c7cf397e94a6a709a5e1daed764e443e3683819df3a1d83a5c