[INFO] cloning repository https://github.com/CaryWillard/TowerOfHanoi
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CaryWillard/TowerOfHanoi" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCaryWillard%2FTowerOfHanoi", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCaryWillard%2FTowerOfHanoi'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b58fc49f22ee80a5bc957191e4b5572a3385e8f6
[INFO] testing CaryWillard/TowerOfHanoi against 1.54.0 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCaryWillard%2FTowerOfHanoi" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CaryWillard/TowerOfHanoi on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CaryWillard/TowerOfHanoi
[INFO] finished tweaking git repo https://github.com/CaryWillard/TowerOfHanoi
[INFO] tweaked toml for git repo https://github.com/CaryWillard/TowerOfHanoi written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/CaryWillard/TowerOfHanoi already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0024bb5c66e9b3c63ca19c747e0210174e200110a2f3d4343bbc6d6ab3466d63
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0024bb5c66e9b3c63ca19c747e0210174e200110a2f3d4343bbc6d6ab3466d63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0024bb5c66e9b3c63ca19c747e0210174e200110a2f3d4343bbc6d6ab3466d63", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0024bb5c66e9b3c63ca19c747e0210174e200110a2f3d4343bbc6d6ab3466d63", kill_on_drop: false }`
[INFO] [stdout] 0024bb5c66e9b3c63ca19c747e0210174e200110a2f3d4343bbc6d6ab3466d63
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1efb8641bbbc49b48fbb0cba4e03ed3ef1b2bcc278880e7b1d1364a47a895769
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1efb8641bbbc49b48fbb0cba4e03ed3ef1b2bcc278880e7b1d1364a47a895769", kill_on_drop: false }`
[INFO] [stderr]    Compiling tower_of_hanoi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[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 `tower_of_hanoi`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "1efb8641bbbc49b48fbb0cba4e03ed3ef1b2bcc278880e7b1d1364a47a895769", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1efb8641bbbc49b48fbb0cba4e03ed3ef1b2bcc278880e7b1d1364a47a895769", kill_on_drop: false }`
[INFO] [stdout] 1efb8641bbbc49b48fbb0cba4e03ed3ef1b2bcc278880e7b1d1364a47a895769