[INFO] cloning repository https://github.com/ada-tv/aec
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ada-tv/aec" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fada-tv%2Faec", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fada-tv%2Faec'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3a0689db79a6bf4e5290a0c13d4a781ecc86e72f
[INFO] checking ada-tv/aec against ba28ff76f353a722f31c4f3dd2ac4e437d36411b for pr-160780
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fada-tv%2Faec" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ada-tv/aec
[INFO] finished tweaking git repo https://github.com/ada-tv/aec
[INFO] tweaked toml for git repo https://github.com/ada-tv/aec written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ada-tv/aec on toolchain ba28ff76f353a722f31c4f3dd2ac4e437d36411b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ba28ff76f353a722f31c4f3dd2ac4e437d36411b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ada-tv/aec already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ba28ff76f353a722f31c4f3dd2ac4e437d36411b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded numtoa v0.1.0
[INFO] [stderr]   Downloaded redox_termios v0.1.2
[INFO] [stderr]   Downloaded termion v2.0.1
[INFO] [stderr]   Downloaded libc v0.2.139
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb
[INFO] running `Command { std: "docker" "start" "21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb" "/opt/rustwide/cargo-home/bin/cargo" "+ba28ff76f353a722f31c4f3dd2ac4e437d36411b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb" "/opt/rustwide/cargo-home/bin/cargo" "+ba28ff76f353a722f31c4f3dd2ac4e437d36411b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking termion v2.0.1
[INFO] [stderr]     Checking aec v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:203:17
[INFO] [stdout]     |
[INFO] [stdout] 203 |             let mut buffer = self.buffers.front_mut().unwrap();
[INFO] [stdout]     |                 ----^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:243:13
[INFO] [stdout]     |
[INFO] [stdout] 243 |         let mut buffer = self.buffers.front_mut().unwrap();
[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/main.rs:203:17
[INFO] [stdout]     |
[INFO] [stdout] 203 |             let mut buffer = self.buffers.front_mut().unwrap();
[INFO] [stdout]     |                 ----^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:243:13
[INFO] [stdout]     |
[INFO] [stdout] 243 |         let mut buffer = self.buffers.front_mut().unwrap();
[INFO] [stdout]     |             ----^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.92s
[INFO] running `Command { std: "docker" "inspect" "21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb", kill_on_drop: false }`
[INFO] [stdout] 21dbf5928c60922c823fcad4b7cccd527f4e6106a7bf0c7e54fb832535bd91eb
