[INFO] cloning repository https://github.com/dannyvankooten/wc.rs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dannyvankooten/wc.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdannyvankooten%2Fwc.rs"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdannyvankooten%2Fwc.rs'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 77fc7fcbb4bd1ba92cb543ae88f03de2cb7b2cfa
[INFO] testing dannyvankooten/wc.rs against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdannyvankooten%2Fwc.rs" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dannyvankooten/wc.rs on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/dannyvankooten/wc.rs
[INFO] finished tweaking git repo https://github.com/dannyvankooten/wc.rs
[INFO] tweaked toml for git repo https://github.com/dannyvankooten/wc.rs written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/dannyvankooten/wc.rs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ec8d93c17bd8af7c37693a236cde0891ca336e5c8e333851aa737e672222654e
[INFO] running `"docker" "start" "-a" "ec8d93c17bd8af7c37693a236cde0891ca336e5c8e333851aa737e672222654e"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling wc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `wc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "ec8d93c17bd8af7c37693a236cde0891ca336e5c8e333851aa737e672222654e"`
[INFO] running `"docker" "rm" "-f" "ec8d93c17bd8af7c37693a236cde0891ca336e5c8e333851aa737e672222654e"`
[INFO] [stdout] ec8d93c17bd8af7c37693a236cde0891ca336e5c8e333851aa737e672222654e