[INFO] fetching crate mutator 0.1.0...
[INFO] testing mutator-0.1.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate mutator 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate mutator 0.1.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a2dc11437ec884dcd8bd852c24384e7b47df722e3b4ee47521a8f0b5e0aef060
[INFO] running `Command { std: "docker" "start" "-a" "a2dc11437ec884dcd8bd852c24384e7b47df722e3b4ee47521a8f0b5e0aef060", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a2dc11437ec884dcd8bd852c24384e7b47df722e3b4ee47521a8f0b5e0aef060", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2dc11437ec884dcd8bd852c24384e7b47df722e3b4ee47521a8f0b5e0aef060", kill_on_drop: false }`
[INFO] [stdout] a2dc11437ec884dcd8bd852c24384e7b47df722e3b4ee47521a8f0b5e0aef060
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0a26103e3f102ecfc5be1a56fc50e1f64d250b6029aaea47d79748d1e234757d
[INFO] running `Command { std: "docker" "start" "-a" "0a26103e3f102ecfc5be1a56fc50e1f64d250b6029aaea47d79748d1e234757d", kill_on_drop: false }`
[INFO] [stderr]    Compiling mutator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `Command { std: "docker" "inspect" "0a26103e3f102ecfc5be1a56fc50e1f64d250b6029aaea47d79748d1e234757d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a26103e3f102ecfc5be1a56fc50e1f64d250b6029aaea47d79748d1e234757d", kill_on_drop: false }`
[INFO] [stdout] 0a26103e3f102ecfc5be1a56fc50e1f64d250b6029aaea47d79748d1e234757d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30874e9ff929361ff3fc6c9fdf968b4692b12b6241420f72824a57550d894d84
[INFO] running `Command { std: "docker" "start" "-a" "30874e9ff929361ff3fc6c9fdf968b4692b12b6241420f72824a57550d894d84", kill_on_drop: false }`
[INFO] [stderr]    Compiling mutator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "30874e9ff929361ff3fc6c9fdf968b4692b12b6241420f72824a57550d894d84", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30874e9ff929361ff3fc6c9fdf968b4692b12b6241420f72824a57550d894d84", kill_on_drop: false }`
[INFO] [stdout] 30874e9ff929361ff3fc6c9fdf968b4692b12b6241420f72824a57550d894d84
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2bfab09032a062655c0ca26d08b2605123b7e15729f2607923ac9338719e3400
[INFO] running `Command { std: "docker" "start" "-a" "2bfab09032a062655c0ca26d08b2605123b7e15729f2607923ac9338719e3400", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mutator-a840577b69771ab1)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mutator
[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 0.31s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2bfab09032a062655c0ca26d08b2605123b7e15729f2607923ac9338719e3400", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bfab09032a062655c0ca26d08b2605123b7e15729f2607923ac9338719e3400", kill_on_drop: false }`
[INFO] [stdout] 2bfab09032a062655c0ca26d08b2605123b7e15729f2607923ac9338719e3400