[INFO] fetching crate snail_sort 1.0.1...
[INFO] testing snail_sort-1.0.1 against 1.59.0 for beta-1.60-1
[INFO] extracting crate snail_sort 1.0.1 into /workspace/builds/worker-16/source
[INFO] validating manifest of crates.io crate snail_sort 1.0.1 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate snail_sort 1.0.1
[INFO] finished tweaking crates.io crate snail_sort 1.0.1
[INFO] tweaked toml for crates.io crate snail_sort 1.0.1 written to /workspace/builds/worker-16/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 28567d2e77240aed31c8f3d036aa6e5dd0e3e7bd387d49744465e55c7c1deed8
[INFO] running `Command { std: "docker" "start" "-a" "28567d2e77240aed31c8f3d036aa6e5dd0e3e7bd387d49744465e55c7c1deed8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "28567d2e77240aed31c8f3d036aa6e5dd0e3e7bd387d49744465e55c7c1deed8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28567d2e77240aed31c8f3d036aa6e5dd0e3e7bd387d49744465e55c7c1deed8", kill_on_drop: false }`
[INFO] [stdout] 28567d2e77240aed31c8f3d036aa6e5dd0e3e7bd387d49744465e55c7c1deed8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7e714e45ae2ff56e5ce8df62d7234e581887e7d04baa3389d07169f213d2160f
[INFO] running `Command { std: "docker" "start" "-a" "7e714e45ae2ff56e5ce8df62d7234e581887e7d04baa3389d07169f213d2160f", kill_on_drop: false }`
[INFO] [stderr]    Compiling snail_sort v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   |            ^^^^
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `snail_sort` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "7e714e45ae2ff56e5ce8df62d7234e581887e7d04baa3389d07169f213d2160f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e714e45ae2ff56e5ce8df62d7234e581887e7d04baa3389d07169f213d2160f", kill_on_drop: false }`
[INFO] [stdout] 7e714e45ae2ff56e5ce8df62d7234e581887e7d04baa3389d07169f213d2160f