[INFO] fetching crate proc-lock-api 0.4.0...
[INFO] checking proc-lock-api-0.4.0 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate proc-lock-api 0.4.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate proc-lock-api 0.4.0
[INFO] finished tweaking crates.io crate proc-lock-api 0.4.0
[INFO] tweaked toml for crates.io crate proc-lock-api 0.4.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate proc-lock-api 0.4.0 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 20 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1de7c23f28a75b602ff94ffe9bce8c4a0c3f7758276852e09cea8e150ef7d72d
[INFO] running `Command { std: "docker" "start" "-a" "1de7c23f28a75b602ff94ffe9bce8c4a0c3f7758276852e09cea8e150ef7d72d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1de7c23f28a75b602ff94ffe9bce8c4a0c3f7758276852e09cea8e150ef7d72d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1de7c23f28a75b602ff94ffe9bce8c4a0c3f7758276852e09cea8e150ef7d72d", kill_on_drop: false }`
[INFO] [stdout] 1de7c23f28a75b602ff94ffe9bce8c4a0c3f7758276852e09cea8e150ef7d72d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 359ab98040ff8ec83bee8377f8d4c7677355afab1f12ac368addc705e526f57b
[INFO] running `Command { std: "docker" "start" "-a" "359ab98040ff8ec83bee8377f8d4c7677355afab1f12ac368addc705e526f57b", kill_on_drop: false }`
[INFO] [stderr]     Checking num-integer v0.1.46
[INFO] [stderr]    Compiling num-bigint v0.1.45
[INFO] [stderr]     Checking rustc-serialize v0.3.25
[INFO] [stderr]    Compiling num-complex v0.1.44
[INFO] [stderr]    Compiling num-rational v0.1.43
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking proc-lock-api v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fs2::FileExt`
[INFO] [stdout]  --> src/lock_guard.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use fs2::FileExt;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking num-iter v0.1.45
[INFO] [stderr]     Checking num v0.1.43
[INFO] [stderr]     Checking spectral v0.6.0
[INFO] [stdout] warning: unused import: `fs2::FileExt`
[INFO] [stdout]  --> src/lock_guard.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use fs2::FileExt;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.10s
[INFO] running `Command { std: "docker" "inspect" "359ab98040ff8ec83bee8377f8d4c7677355afab1f12ac368addc705e526f57b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "359ab98040ff8ec83bee8377f8d4c7677355afab1f12ac368addc705e526f57b", kill_on_drop: false }`
[INFO] [stdout] 359ab98040ff8ec83bee8377f8d4c7677355afab1f12ac368addc705e526f57b