[INFO] fetching crate mutator 0.1.0...
[INFO] testing mutator-0.1.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate mutator 0.1.0 into /workspace/builds/worker-54/source
[INFO] validating manifest of crates.io crate mutator 0.1.0 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-54/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d2905f266ec15bcef90a45ed715d231b14d8cfcb24ddab5b04a24f9a2c1fef57
[INFO] running `Command { std: "docker" "start" "-a" "d2905f266ec15bcef90a45ed715d231b14d8cfcb24ddab5b04a24f9a2c1fef57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2905f266ec15bcef90a45ed715d231b14d8cfcb24ddab5b04a24f9a2c1fef57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2905f266ec15bcef90a45ed715d231b14d8cfcb24ddab5b04a24f9a2c1fef57", kill_on_drop: false }`
[INFO] [stdout] d2905f266ec15bcef90a45ed715d231b14d8cfcb24ddab5b04a24f9a2c1fef57
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 51c2b41fadefd879f4d9461e11712131ee3c5ef4a352a74d0a729acd3df5c7b0
[INFO] running `Command { std: "docker" "start" "-a" "51c2b41fadefd879f4d9461e11712131ee3c5ef4a352a74d0a729acd3df5c7b0", kill_on_drop: false }`
[INFO] [stderr]    Compiling mutator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "51c2b41fadefd879f4d9461e11712131ee3c5ef4a352a74d0a729acd3df5c7b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "51c2b41fadefd879f4d9461e11712131ee3c5ef4a352a74d0a729acd3df5c7b0", kill_on_drop: false }`
[INFO] [stdout] 51c2b41fadefd879f4d9461e11712131ee3c5ef4a352a74d0a729acd3df5c7b0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ffef118d2d09daf3d6be0f711a873c49e2c9617aca3dddb45717184cf115ca70
[INFO] running `Command { std: "docker" "start" "-a" "ffef118d2d09daf3d6be0f711a873c49e2c9617aca3dddb45717184cf115ca70", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling mutator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.77s
[INFO] [stderr]   Executable unittests src/lib.rs (/opt/rustwide/target/debug/deps/mutator-a840577b69771ab1)
[INFO] running `Command { std: "docker" "inspect" "ffef118d2d09daf3d6be0f711a873c49e2c9617aca3dddb45717184cf115ca70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffef118d2d09daf3d6be0f711a873c49e2c9617aca3dddb45717184cf115ca70", kill_on_drop: false }`
[INFO] [stdout] ffef118d2d09daf3d6be0f711a873c49e2c9617aca3dddb45717184cf115ca70
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d77d58fb1eb3e72f0ef24f754fdf12873a04b7376996e2a3aba4e51f117a84f2
[INFO] running `Command { std: "docker" "start" "-a" "d77d58fb1eb3e72f0ef24f754fdf12873a04b7376996e2a3aba4e51f117a84f2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.59s
[INFO] [stderr]      Running unittests src/lib.rs (/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 0.56s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d77d58fb1eb3e72f0ef24f754fdf12873a04b7376996e2a3aba4e51f117a84f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d77d58fb1eb3e72f0ef24f754fdf12873a04b7376996e2a3aba4e51f117a84f2", kill_on_drop: false }`
[INFO] [stdout] d77d58fb1eb3e72f0ef24f754fdf12873a04b7376996e2a3aba4e51f117a84f2