[INFO] cloning repository https://github.com/merlox/rust-exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/merlox/rust-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmerlox%2Frust-exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmerlox%2Frust-exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 84c9fe36de878e2478834fa70d6e7ce562abde3a
[INFO] testing merlox/rust-exercises against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmerlox%2Frust-exercises" "/workspace/builds/worker-50/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-50/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/merlox/rust-exercises 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 git repo https://github.com/merlox/rust-exercises
[INFO] finished tweaking git repo https://github.com/merlox/rust-exercises
[INFO] tweaked toml for git repo https://github.com/merlox/rust-exercises written to /workspace/builds/worker-50/source/Cargo.toml
[INFO] crate git repo https://github.com/merlox/rust-exercises already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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] 88e90e58cbaaa69fd379f18cfcd68080eeb4d26b9b9b69f6c73d51b17d07fe0c
[INFO] running `Command { std: "docker" "start" "-a" "88e90e58cbaaa69fd379f18cfcd68080eeb4d26b9b9b69f6c73d51b17d07fe0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88e90e58cbaaa69fd379f18cfcd68080eeb4d26b9b9b69f6c73d51b17d07fe0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88e90e58cbaaa69fd379f18cfcd68080eeb4d26b9b9b69f6c73d51b17d07fe0c", kill_on_drop: false }`
[INFO] [stdout] 88e90e58cbaaa69fd379f18cfcd68080eeb4d26b9b9b69f6c73d51b17d07fe0c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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] fc2300cf7f5d872ad7c10286132451def293293c48bc7fa707da6d4ff775e28a
[INFO] running `Command { std: "docker" "start" "-a" "fc2300cf7f5d872ad7c10286132451def293293c48bc7fa707da6d4ff775e28a", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
[INFO] running `Command { std: "docker" "inspect" "fc2300cf7f5d872ad7c10286132451def293293c48bc7fa707da6d4ff775e28a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc2300cf7f5d872ad7c10286132451def293293c48bc7fa707da6d4ff775e28a", kill_on_drop: false }`
[INFO] [stdout] fc2300cf7f5d872ad7c10286132451def293293c48bc7fa707da6d4ff775e28a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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] 6217ce1583228f478ee776e954c0210c09ff0383f99d7acd896277a19a855b94
[INFO] running `Command { std: "docker" "start" "-a" "6217ce1583228f478ee776e954c0210c09ff0383f99d7acd896277a19a855b94", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `Command { std: "docker" "inspect" "6217ce1583228f478ee776e954c0210c09ff0383f99d7acd896277a19a855b94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6217ce1583228f478ee776e954c0210c09ff0383f99d7acd896277a19a855b94", kill_on_drop: false }`
[INFO] [stdout] 6217ce1583228f478ee776e954c0210c09ff0383f99d7acd896277a19a855b94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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] 71beb86eae6ebc4a82dcd65fce63dc9cd51f9b738d31cbf21e7e8a28e812fdab
[INFO] running `Command { std: "docker" "start" "-a" "71beb86eae6ebc4a82dcd65fce63dc9cd51f9b738d31cbf21e7e8a28e812fdab", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_exercises-fdf34681f02c3429)
[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] running `Command { std: "docker" "inspect" "71beb86eae6ebc4a82dcd65fce63dc9cd51f9b738d31cbf21e7e8a28e812fdab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71beb86eae6ebc4a82dcd65fce63dc9cd51f9b738d31cbf21e7e8a28e812fdab", kill_on_drop: false }`
[INFO] [stdout] 71beb86eae6ebc4a82dcd65fce63dc9cd51f9b738d31cbf21e7e8a28e812fdab