[INFO] fetching crate tf_playlist 0.1.4...
[INFO] building tf_playlist-0.1.4 against master#ad85bc524b1ad696e42061ad8338d382dffbdbe5 for pr-146237-1
[INFO] extracting crate tf_playlist 0.1.4 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate tf_playlist 0.1.4
[INFO] finished tweaking crates.io crate tf_playlist 0.1.4
[INFO] tweaked toml for crates.io crate tf_playlist 0.1.4 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate tf_playlist 0.1.4 on toolchain ad85bc524b1ad696e42061ad8338d382dffbdbe5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tf_observer v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d72fd55da5b96e5de45180a4168cf36757114a85d97c0fa632a99b4cd90fc3b6
[INFO] running `Command { std: "docker" "start" "-a" "d72fd55da5b96e5de45180a4168cf36757114a85d97c0fa632a99b4cd90fc3b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d72fd55da5b96e5de45180a4168cf36757114a85d97c0fa632a99b4cd90fc3b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d72fd55da5b96e5de45180a4168cf36757114a85d97c0fa632a99b4cd90fc3b6", kill_on_drop: false }`
[INFO] [stdout] d72fd55da5b96e5de45180a4168cf36757114a85d97c0fa632a99b4cd90fc3b6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a68e8345b546731b3530d2f11bdcde0ab714d1b0c5defb1c067e0b19b3f57adc
[INFO] running `Command { std: "docker" "start" "-a" "a68e8345b546731b3530d2f11bdcde0ab714d1b0c5defb1c067e0b19b3f57adc", kill_on_drop: false }`
[INFO] [stderr]    Compiling tf_observer v0.1.3
[INFO] [stderr]    Compiling tf_playlist v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist.rs:90:45
[INFO] [stdout]    |
[INFO] [stdout] 90 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 90 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 90 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist.rs:97:45
[INFO] [stdout]    |
[INFO] [stdout] 97 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 97 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 97 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist_manager.rs:54:45
[INFO] [stdout]    |
[INFO] [stdout] 54 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 54 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 54 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist_manager.rs:70:45
[INFO] [stdout]    |
[INFO] [stdout] 70 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 70 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 70 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/playlist_manager.rs:106:45
[INFO] [stdout]     |
[INFO] [stdout] 106 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]     |                                             ^                                               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 106 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 106 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/playlist_manager.rs:114:45
[INFO] [stdout]     |
[INFO] [stdout] 114 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]     |                                             ^                                               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 114 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 114 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.23s
[INFO] running `Command { std: "docker" "inspect" "a68e8345b546731b3530d2f11bdcde0ab714d1b0c5defb1c067e0b19b3f57adc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a68e8345b546731b3530d2f11bdcde0ab714d1b0c5defb1c067e0b19b3f57adc", kill_on_drop: false }`
[INFO] [stdout] a68e8345b546731b3530d2f11bdcde0ab714d1b0c5defb1c067e0b19b3f57adc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fa109d87457ba7f6aac913286bc56af9c66b3a6612a11f11696bebff92a911e5
[INFO] running `Command { std: "docker" "start" "-a" "fa109d87457ba7f6aac913286bc56af9c66b3a6612a11f11696bebff92a911e5", kill_on_drop: false }`
[INFO] [stderr]    Compiling tf_playlist v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist.rs:90:45
[INFO] [stdout]    |
[INFO] [stdout] 90 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 90 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 90 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist.rs:97:45
[INFO] [stdout]    |
[INFO] [stdout] 97 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 97 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 97 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist_manager.rs:54:45
[INFO] [stdout]    |
[INFO] [stdout] 54 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 54 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 54 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist_manager.rs:70:45
[INFO] [stdout]    |
[INFO] [stdout] 70 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 70 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 70 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/playlist_manager.rs:106:45
[INFO] [stdout]     |
[INFO] [stdout] 106 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]     |                                             ^                                               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 106 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 106 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/playlist_manager.rs:114:45
[INFO] [stdout]     |
[INFO] [stdout] 114 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]     |                                             ^                                               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 114 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 114 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist.rs:90:45
[INFO] [stdout]    |
[INFO] [stdout] 90 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 90 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 90 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist.rs:97:45
[INFO] [stdout]    |
[INFO] [stdout] 97 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 97 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 97 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist_manager.rs:54:45
[INFO] [stdout]    |
[INFO] [stdout] 54 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 54 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 54 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> src/playlist_manager.rs:70:45
[INFO] [stdout]    |
[INFO] [stdout] 70 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]    |                                             ^                                               ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 70 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 70 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/playlist_manager.rs:106:45
[INFO] [stdout]     |
[INFO] [stdout] 106 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]     |                                             ^                                               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 106 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 106 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/playlist_manager.rs:114:45
[INFO] [stdout]     |
[INFO] [stdout] 114 |         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout]     |                                             ^                                               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 114 -         observer: std::sync::Weak<Mutex<Box<(dyn Observer<PlaylistEvent<T>> + Send + 'static)>>>,
[INFO] [stdout] 114 +         observer: std::sync::Weak<Mutex<Box<dyn Observer<PlaylistEvent<T>> + Send + 'static>>>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "fa109d87457ba7f6aac913286bc56af9c66b3a6612a11f11696bebff92a911e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa109d87457ba7f6aac913286bc56af9c66b3a6612a11f11696bebff92a911e5", kill_on_drop: false }`
[INFO] [stdout] fa109d87457ba7f6aac913286bc56af9c66b3a6612a11f11696bebff92a911e5
