[INFO] fetching crate mutator 0.1.0...
[INFO] testing mutator-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate mutator 0.1.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate mutator 0.1.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mutator 0.1.0
[INFO] finished tweaking crates.io crate mutator 0.1.0
[INFO] tweaked toml for crates.io crate mutator 0.1.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 961f0b42357a6765caef647ef5af64904083b4ae82d4c34f977ebc1173aa3b63
[INFO] running `Command { std: "docker" "start" "-a" "961f0b42357a6765caef647ef5af64904083b4ae82d4c34f977ebc1173aa3b63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "961f0b42357a6765caef647ef5af64904083b4ae82d4c34f977ebc1173aa3b63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "961f0b42357a6765caef647ef5af64904083b4ae82d4c34f977ebc1173aa3b63", kill_on_drop: false }`
[INFO] [stdout] 961f0b42357a6765caef647ef5af64904083b4ae82d4c34f977ebc1173aa3b63
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] baca27fab81ab930c0fb8f0e5d8c340639f9943b7ded6a006823e1f1aabc4e71
[INFO] running `Command { std: "docker" "start" "-a" "baca27fab81ab930c0fb8f0e5d8c340639f9943b7ded6a006823e1f1aabc4e71", kill_on_drop: false }`
[INFO] [stderr]    Compiling mutator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.67s
[INFO] running `Command { std: "docker" "inspect" "baca27fab81ab930c0fb8f0e5d8c340639f9943b7ded6a006823e1f1aabc4e71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "baca27fab81ab930c0fb8f0e5d8c340639f9943b7ded6a006823e1f1aabc4e71", kill_on_drop: false }`
[INFO] [stdout] baca27fab81ab930c0fb8f0e5d8c340639f9943b7ded6a006823e1f1aabc4e71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 550bd0aa1de3f5c8358329511549c3ecfab911703fcde2131a012d33dfae8ca3
[INFO] running `Command { std: "docker" "start" "-a" "550bd0aa1de3f5c8358329511549c3ecfab911703fcde2131a012d33dfae8ca3", kill_on_drop: false }`
[INFO] [stderr]    Compiling mutator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "550bd0aa1de3f5c8358329511549c3ecfab911703fcde2131a012d33dfae8ca3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "550bd0aa1de3f5c8358329511549c3ecfab911703fcde2131a012d33dfae8ca3", kill_on_drop: false }`
[INFO] [stdout] 550bd0aa1de3f5c8358329511549c3ecfab911703fcde2131a012d33dfae8ca3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] abd18323a16e7139b1a24428b1bd3258b6789c746f8df5a7d6b95c939ad9c14c
[INFO] running `Command { std: "docker" "start" "-a" "abd18323a16e7139b1a24428b1bd3258b6789c746f8df5a7d6b95c939ad9c14c", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mutator-43c25443360c2df5)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mutator
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 9) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.32s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "abd18323a16e7139b1a24428b1bd3258b6789c746f8df5a7d6b95c939ad9c14c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "abd18323a16e7139b1a24428b1bd3258b6789c746f8df5a7d6b95c939ad9c14c", kill_on_drop: false }`
[INFO] [stdout] abd18323a16e7139b1a24428b1bd3258b6789c746f8df5a7d6b95c939ad9c14c