[INFO] cloning repository https://github.com/brsamb9/Nand2tetris_PartTwo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/brsamb9/Nand2tetris_PartTwo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrsamb9%2FNand2tetris_PartTwo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrsamb9%2FNand2tetris_PartTwo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2022c75cae509e31168deea33f8ce11072061c0b
[INFO] documenting brsamb9/Nand2tetris_PartTwo against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrsamb9%2FNand2tetris_PartTwo" "/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/brsamb9/Nand2tetris_PartTwo 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/brsamb9/Nand2tetris_PartTwo
[INFO] finished tweaking git repo https://github.com/brsamb9/Nand2tetris_PartTwo
[INFO] tweaked toml for git repo https://github.com/brsamb9/Nand2tetris_PartTwo written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/brsamb9/Nand2tetris_PartTwo 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-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aa3c5713fcc4cf629c302c1a664a9c325b0e4d9a6811ab45ca0a70e841aacd8d
[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" "aa3c5713fcc4cf629c302c1a664a9c325b0e4d9a6811ab45ca0a70e841aacd8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa3c5713fcc4cf629c302c1a664a9c325b0e4d9a6811ab45ca0a70e841aacd8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa3c5713fcc4cf629c302c1a664a9c325b0e4d9a6811ab45ca0a70e841aacd8d", kill_on_drop: false }`
[INFO] [stdout] aa3c5713fcc4cf629c302c1a664a9c325b0e4d9a6811ab45ca0a70e841aacd8d
[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" "RUSTDOCFLAGS=--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" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 712b1c5526f3e31c696f7d9ee3f9d8431fa5011870659f10262dbd96383492c2
[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" "712b1c5526f3e31c696f7d9ee3f9d8431fa5011870659f10262dbd96383492c2", kill_on_drop: false }`
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/regex-1.3.9/src/lib.rs:618:34
[INFO] [stdout]     |
[INFO] [stdout] 618 | #![cfg_attr(feature = "pattern", feature(pattern))]
[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 `regex`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "712b1c5526f3e31c696f7d9ee3f9d8431fa5011870659f10262dbd96383492c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "712b1c5526f3e31c696f7d9ee3f9d8431fa5011870659f10262dbd96383492c2", kill_on_drop: false }`
[INFO] [stdout] 712b1c5526f3e31c696f7d9ee3f9d8431fa5011870659f10262dbd96383492c2
