[INFO] fetching crate insult 2.0.3...
[INFO] checking insult-2.0.3 against master#0599f3403366d9c57f0625e6de3af214b5042a90 for pr-87710
[INFO] extracting crate insult 2.0.3 into /workspace/builds/worker-51/source
[INFO] validating manifest of crates.io crate insult 2.0.3 on toolchain 0599f3403366d9c57f0625e6de3af214b5042a90
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate insult 2.0.3
[INFO] finished tweaking crates.io crate insult 2.0.3
[INFO] tweaked toml for crates.io crate insult 2.0.3 written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 799bafa1b47198213b8a1604e2d373c14da5aedeedb059f8d760cb08f5b03036
[INFO] running `Command { std: "docker" "start" "-a" "799bafa1b47198213b8a1604e2d373c14da5aedeedb059f8d760cb08f5b03036", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "799bafa1b47198213b8a1604e2d373c14da5aedeedb059f8d760cb08f5b03036", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "799bafa1b47198213b8a1604e2d373c14da5aedeedb059f8d760cb08f5b03036", kill_on_drop: false }`
[INFO] [stdout] 799bafa1b47198213b8a1604e2d373c14da5aedeedb059f8d760cb08f5b03036
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 33ddf714bbfc19f897df00a6d6ffb111002a242c7371be2636f3bc6cf363baa4
[INFO] running `Command { std: "docker" "start" "-a" "33ddf714bbfc19f897df00a6d6ffb111002a242c7371be2636f3bc6cf363baa4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking xdg v2.2.0
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking backtrace v0.3.61
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking insult v2.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 25 |         let mut buf = fs::read_to_string(config)?;
[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/main.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 25 |         let mut buf = fs::read_to_string(config)?;
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.27s
[INFO] running `Command { std: "docker" "inspect" "33ddf714bbfc19f897df00a6d6ffb111002a242c7371be2636f3bc6cf363baa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33ddf714bbfc19f897df00a6d6ffb111002a242c7371be2636f3bc6cf363baa4", kill_on_drop: false }`
[INFO] [stdout] 33ddf714bbfc19f897df00a6d6ffb111002a242c7371be2636f3bc6cf363baa4