[INFO] cloning repository https://github.com/nickeb96/preprocessor
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nickeb96/preprocessor" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickeb96%2Fpreprocessor", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickeb96%2Fpreprocessor'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 73c8cea8a2b645546d08731142313827d225edf5
[INFO] testing nickeb96/preprocessor against 1.54.0 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickeb96%2Fpreprocessor" "/workspace/builds/worker-60/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-60/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nickeb96/preprocessor 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/nickeb96/preprocessor
[INFO] finished tweaking git repo https://github.com/nickeb96/preprocessor
[INFO] tweaked toml for git repo https://github.com/nickeb96/preprocessor written to /workspace/builds/worker-60/source/Cargo.toml
[INFO] crate git repo https://github.com/nickeb96/preprocessor 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] [stderr]     Updating git repository `https://github.com/nickeb96/tokenizer`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v0.13.4
[INFO] [stderr]   Downloaded indoc v0.2.5
[INFO] [stderr]   Downloaded indoc-impl v0.2.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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] f24a484da732943706ad15988f09f81edfa27c7ddbfd27a43e1020b4a4207230
[INFO] running `Command { std: "docker" "start" "-a" "f24a484da732943706ad15988f09f81edfa27c7ddbfd27a43e1020b4a4207230", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f24a484da732943706ad15988f09f81edfa27c7ddbfd27a43e1020b4a4207230", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f24a484da732943706ad15988f09f81edfa27c7ddbfd27a43e1020b4a4207230", kill_on_drop: false }`
[INFO] [stdout] f24a484da732943706ad15988f09f81edfa27c7ddbfd27a43e1020b4a4207230
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-60/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] de23a4693c1ac1886082e95522ab4613b564662dbb3918f044042ca4c8e00874
[INFO] running `Command { std: "docker" "start" "-a" "de23a4693c1ac1886082e95522ab4613b564662dbb3918f044042ca4c8e00874", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.40
[INFO] [stderr]    Compiling proc-macro-hack-impl v0.4.0
[INFO] [stderr]    Compiling ucd-util v0.1.1
[INFO] [stderr]    Compiling lazy_static v1.0.0
[INFO] [stderr]    Compiling regex v1.0.0
[INFO] [stderr]    Compiling unindent v0.1.3
[INFO] [stderr]    Compiling utf8-ranges v1.0.0
[INFO] [stderr]    Compiling getopts v0.2.17
[INFO] [stderr]    Compiling proc-macro2 v0.3.8
[INFO] [stderr]    Compiling thread_local v0.3.5
[INFO] [stderr]    Compiling regex-syntax v0.6.0
[INFO] [stderr]    Compiling quote v0.5.2
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling aho-corasick v0.6.4
[INFO] [stderr]    Compiling syn v0.13.4
[INFO] [stderr]    Compiling proc-macro-hack v0.4.0
[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-1.0.0/src/lib.rs:522:34
[INFO] [stdout]     |
[INFO] [stdout] 522 | #![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] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "de23a4693c1ac1886082e95522ab4613b564662dbb3918f044042ca4c8e00874", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de23a4693c1ac1886082e95522ab4613b564662dbb3918f044042ca4c8e00874", kill_on_drop: false }`
[INFO] [stdout] de23a4693c1ac1886082e95522ab4613b564662dbb3918f044042ca4c8e00874
