[INFO] cloning repository https://github.com/BrianMiltonJr/MusicHandler
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BrianMiltonJr/MusicHandler" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrianMiltonJr%2FMusicHandler", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrianMiltonJr%2FMusicHandler'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 31c2128412b456a8386eb1a430f2d67b41d25021
[INFO] checking BrianMiltonJr/MusicHandler against master#90442458ac46b1d5eed752c316da25450f67285b for pr-81477
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBrianMiltonJr%2FMusicHandler" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BrianMiltonJr/MusicHandler on toolchain 90442458ac46b1d5eed752c316da25450f67285b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BrianMiltonJr/MusicHandler
[INFO] finished tweaking git repo https://github.com/BrianMiltonJr/MusicHandler
[INFO] tweaked toml for git repo https://github.com/BrianMiltonJr/MusicHandler written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/BrianMiltonJr/MusicHandler already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9fe9ace327398c7d40085612cb31af35974d38429b2f0db6973334f8219a9132
[INFO] running `Command { std: "docker" "start" "-a" "9fe9ace327398c7d40085612cb31af35974d38429b2f0db6973334f8219a9132", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9fe9ace327398c7d40085612cb31af35974d38429b2f0db6973334f8219a9132", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9fe9ace327398c7d40085612cb31af35974d38429b2f0db6973334f8219a9132", kill_on_drop: false }`
[INFO] [stdout] 9fe9ace327398c7d40085612cb31af35974d38429b2f0db6973334f8219a9132
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:ea7d7bff36b2ba8ce4de8bba1d2dea90376bc481f1a945a913994a8c492e40c1" "/opt/rustwide/cargo-home/bin/cargo" "+90442458ac46b1d5eed752c316da25450f67285b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 738779f388ab14c07fdfa850d219b7f607bf2b89d4dd940715cc66cb8bfdb6d8
[INFO] running `Command { std: "docker" "start" "-a" "738779f388ab14c07fdfa850d219b7f607bf2b89d4dd940715cc66cb8bfdb6d8", kill_on_drop: false }`
[INFO] [stderr]     Checking home v0.5.3
[INFO] [stderr]     Checking music-application v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `tag`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     tag: &'a String
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_music`
[INFO] [stdout]    --> src/main.rs:181:4
[INFO] [stdout]     |
[INFO] [stdout] 181 | fn get_music(dir: String) -> Vec<String> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 | /         match song.music.exists() {
[INFO] [stdout] 123 | |             true => Ok(fs::remove_file(song.music)),
[INFO] [stdout] 124 | |             false => Err(false)
[INFO] [stdout] 125 | |         };
[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/main.rs:153:5
[INFO] [stdout]     |
[INFO] [stdout] 153 | /     match playlist_path.exists() {
[INFO] [stdout] 154 | |         true => Ok(fs::remove_file(playlist_path)),
[INFO] [stdout] 155 | |         false => Err(false),
[INFO] [stdout] 156 | |     };
[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: field is never read: `tag`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     tag: &'a String
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `get_music`
[INFO] [stdout]    --> src/main.rs:181:4
[INFO] [stdout]     |
[INFO] [stdout] 181 | fn get_music(dir: String) -> Vec<String> {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 | /         match song.music.exists() {
[INFO] [stdout] 123 | |             true => Ok(fs::remove_file(song.music)),
[INFO] [stdout] 124 | |             false => Err(false)
[INFO] [stdout] 125 | |         };
[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/main.rs:153:5
[INFO] [stdout]     |
[INFO] [stdout] 153 | /     match playlist_path.exists() {
[INFO] [stdout] 154 | |         true => Ok(fs::remove_file(playlist_path)),
[INFO] [stdout] 155 | |         false => Err(false),
[INFO] [stdout] 156 | |     };
[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: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `Command { std: "docker" "inspect" "738779f388ab14c07fdfa850d219b7f607bf2b89d4dd940715cc66cb8bfdb6d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "738779f388ab14c07fdfa850d219b7f607bf2b89d4dd940715cc66cb8bfdb6d8", kill_on_drop: false }`
[INFO] [stdout] 738779f388ab14c07fdfa850d219b7f607bf2b89d4dd940715cc66cb8bfdb6d8