[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] checking brsamb9/Nand2tetris_PartTwo against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrsamb9%2FNand2tetris_PartTwo" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/brsamb9/Nand2tetris_PartTwo on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", 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-1/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" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 672cb780e43e751cc0b5f6b3c17ca75e1ef8f586bd5dbbbf4b0593269ffe3cf3
[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" "672cb780e43e751cc0b5f6b3c17ca75e1ef8f586bd5dbbbf4b0593269ffe3cf3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "672cb780e43e751cc0b5f6b3c17ca75e1ef8f586bd5dbbbf4b0593269ffe3cf3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "672cb780e43e751cc0b5f6b3c17ca75e1ef8f586bd5dbbbf4b0593269ffe3cf3", kill_on_drop: false }`
[INFO] [stdout] 672cb780e43e751cc0b5f6b3c17ca75e1ef8f586bd5dbbbf4b0593269ffe3cf3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=forbid" "-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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e6fb5d39dfe5151169e76d2ead156ffd39e495fe1f88b9f4fe34c6e7e8c85d7a
[INFO] running `Command { std: "docker" "start" "-a" "e6fb5d39dfe5151169e76d2ead156ffd39e495fe1f88b9f4fe34c6e7e8c85d7a", kill_on_drop: false }`
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta 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" "e6fb5d39dfe5151169e76d2ead156ffd39e495fe1f88b9f4fe34c6e7e8c85d7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6fb5d39dfe5151169e76d2ead156ffd39e495fe1f88b9f4fe34c6e7e8c85d7a", kill_on_drop: false }`
[INFO] [stdout] e6fb5d39dfe5151169e76d2ead156ffd39e495fe1f88b9f4fe34c6e7e8c85d7a