[INFO] cloning repository https://github.com/skrapi/grrs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/skrapi/grrs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fskrapi%2Fgrrs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fskrapi%2Fgrrs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6129ce7af7714d0cb254c29a756b9eeed0c29d90
[INFO] testing skrapi/grrs against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fskrapi%2Fgrrs" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/skrapi/grrs 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 git repo https://github.com/skrapi/grrs
[INFO] finished tweaking git repo https://github.com/skrapi/grrs
[INFO] tweaked toml for git repo https://github.com/skrapi/grrs written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/skrapi/grrs already has a lockfile, it will not be regenerated
[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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 99d5fae807c2f624b17f134a631c0c974c142b20d63bc38119d43bba7dd49bec
[INFO] running `Command { std: "docker" "start" "-a" "99d5fae807c2f624b17f134a631c0c974c142b20d63bc38119d43bba7dd49bec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "99d5fae807c2f624b17f134a631c0c974c142b20d63bc38119d43bba7dd49bec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99d5fae807c2f624b17f134a631c0c974c142b20d63bc38119d43bba7dd49bec", kill_on_drop: false }`
[INFO] [stdout] 99d5fae807c2f624b17f134a631c0c974c142b20d63bc38119d43bba7dd49bec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 4bdd3ac659e6392848cd3a2fef34bbaf83e6c01ebdaf8b7d4bc8830eeab7c41f
[INFO] running `Command { std: "docker" "start" "-a" "4bdd3ac659e6392848cd3a2fef34bbaf83e6c01ebdaf8b7d4bc8830eeab7c41f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.7
[INFO] [stderr]    Compiling libc v0.2.65
[INFO] [stderr]    Compiling unicode-segmentation v1.5.0
[INFO] [stderr]    Compiling unicode-width v0.1.6
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling proc-macro-error v0.2.6
[INFO] [stderr]    Compiling structopt-derive v0.3.3
[INFO] [stderr]    Compiling structopt v0.3.3
[INFO] [stderr]    Compiling grrs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature 'option_result_contains'
[INFO] [stdout]   --> src/main.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |         if line.contains(&args.pattern) {
[INFO] [stdout]    |                 ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #62358 <https://github.com/rust-lang/rust/issues/62358> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `grrs` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "4bdd3ac659e6392848cd3a2fef34bbaf83e6c01ebdaf8b7d4bc8830eeab7c41f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bdd3ac659e6392848cd3a2fef34bbaf83e6c01ebdaf8b7d4bc8830eeab7c41f", kill_on_drop: false }`
[INFO] [stdout] 4bdd3ac659e6392848cd3a2fef34bbaf83e6c01ebdaf8b7d4bc8830eeab7c41f