[INFO] updating cached repository https://github.com/tilda/rusty-bot
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8ab689e34cf1f7f035755bd9576ffe4d1ef2a259
[INFO] checking tilda/rusty-bot against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftilda%2Frusty-bot" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tilda/rusty-bot on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/tilda/rusty-bot
[INFO] finished tweaking git repo https://github.com/tilda/rusty-bot
[INFO] tweaked toml for git repo https://github.com/tilda/rusty-bot written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/tilda/rusty-bot already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 034f2a0a23d44498bc1f0dfe763c82de92ad49e6c25a06e9303a7612552af019
[INFO] running `"docker" "start" "-a" "034f2a0a23d44498bc1f0dfe763c82de92ad49e6c25a06e9303a7612552af019"`
[INFO] [stderr]    Compiling serde v1.0.65
[INFO] [stderr]     Checking slog v2.2.3
[INFO] [stderr]     Checking trackable v0.2.17
[INFO] [stderr]    Compiling openssl-sys v0.9.31
[INFO] [stderr]    Compiling proc-macro2 v0.4.4
[INFO] [stderr]     Checking base64 v0.8.0
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]     Checking uuid v0.5.1
[INFO] [stderr]     Checking hyper v0.10.13
[INFO] [stderr]     Checking flate2 v1.0.1
[INFO] [stderr]     Checking slog-scope v4.0.1
[INFO] [stderr]     Checking slog-async v2.3.0
[INFO] [stderr]    Compiling mime_guess v1.8.4
[INFO] [stderr]     Checking slog-stdlog v3.0.2
[INFO] [stderr]    Compiling quote v0.6.3
[INFO] [stderr]    Compiling syn v0.14.1
[INFO] [stderr]    Compiling openssl v0.9.24
[INFO] [stderr]     Checking multipart v0.13.6
[INFO] [stderr]     Checking native-tls v0.1.5
[INFO] [stderr]     Checking hyper-native-tls v0.2.4
[INFO] [stderr]     Checking evzht9h3nznqzwl v0.0.3
[INFO] [stderr]    Compiling serde_derive v1.0.65
[INFO] [stderr]     Checking chrono v0.4.2
[INFO] [stderr]     Checking serde_json v1.0.19
[INFO] [stderr]     Checking slog-term v2.4.0
[INFO] [stderr]     Checking serenity v0.5.3
[INFO] [stderr]     Checking sloggers v0.2.6
[INFO] [stderr]     Checking rusty v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let mut file = File::open("config.json").expect("Not found");
[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/main.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let mut file = File::open("config.json").expect("Not found");
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1m 22s
[INFO] running `"docker" "inspect" "034f2a0a23d44498bc1f0dfe763c82de92ad49e6c25a06e9303a7612552af019"`
[INFO] running `"docker" "rm" "-f" "034f2a0a23d44498bc1f0dfe763c82de92ad49e6c25a06e9303a7612552af019"`
[INFO] [stdout] 034f2a0a23d44498bc1f0dfe763c82de92ad49e6c25a06e9303a7612552af019