[INFO] fetching crate mechutil 0.2.2...
[INFO] checking mechutil-0.2.2 against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] extracting crate mechutil 0.2.2 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate mechutil 0.2.2 on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mechutil 0.2.2
[INFO] finished tweaking crates.io crate mechutil 0.2.2
[INFO] tweaked toml for crates.io crate mechutil 0.2.2 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 17 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7b8bd62df66c176269d23d7cf04123a203b5bed185eb6eb508b1e167695a9b7a
[INFO] running `Command { std: "docker" "start" "-a" "7b8bd62df66c176269d23d7cf04123a203b5bed185eb6eb508b1e167695a9b7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b8bd62df66c176269d23d7cf04123a203b5bed185eb6eb508b1e167695a9b7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b8bd62df66c176269d23d7cf04123a203b5bed185eb6eb508b1e167695a9b7a", kill_on_drop: false }`
[INFO] [stdout] 7b8bd62df66c176269d23d7cf04123a203b5bed185eb6eb508b1e167695a9b7a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 07fe05f06d7c21a2d23e5750995d43f90ee7ae2a3e72f2e6a84f894f4f69ca76
[INFO] running `Command { std: "docker" "start" "-a" "07fe05f06d7c21a2d23e5750995d43f90ee7ae2a3e72f2e6a84f894f4f69ca76", kill_on_drop: false }`
[INFO] [stderr]     Checking serde v1.0.209
[INFO] [stderr]     Checking indexmap v2.5.0
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking serde_json v1.0.127
[INFO] [stderr]     Checking mechutil v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/variant.rs:170:25
[INFO] [stdout]     |
[INFO] [stdout] 170 |                         i => Ok(VariantValue::Int64(int)),
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> src/variant.rs:177:25
[INFO] [stdout]     |
[INFO] [stdout] 177 |                         u => Ok(VariantValue::UInt64(uint)),
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/variant.rs:170:25
[INFO] [stdout]     |
[INFO] [stdout] 170 |                         i => Ok(VariantValue::Int64(int)),
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]    --> src/variant.rs:177:25
[INFO] [stdout]     |
[INFO] [stdout] 177 |                         u => Ok(VariantValue::UInt64(uint)),
[INFO] [stdout]     |                         ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.62s
[INFO] running `Command { std: "docker" "inspect" "07fe05f06d7c21a2d23e5750995d43f90ee7ae2a3e72f2e6a84f894f4f69ca76", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07fe05f06d7c21a2d23e5750995d43f90ee7ae2a3e72f2e6a84f894f4f69ca76", kill_on_drop: false }`
[INFO] [stdout] 07fe05f06d7c21a2d23e5750995d43f90ee7ae2a3e72f2e6a84f894f4f69ca76