[INFO] updating cached repository https://github.com/crumblingstatue/gmktool
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9c3b6f3675f1a94855cbbec143041dfeb31c814d
[INFO] checking crumblingstatue/gmktool against try#8810c24b0958114d8dbb32d878444e8956fce80f for pr-66063
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcrumblingstatue%2Fgmktool" "/workspace/builds/worker-6/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/crumblingstatue/gmktool on toolchain 8810c24b0958114d8dbb32d878444e8956fce80f
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/crumblingstatue/gmktool
[INFO] finished tweaking git repo https://github.com/crumblingstatue/gmktool
[INFO] tweaked toml for git repo https://github.com/crumblingstatue/gmktool written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/crumblingstatue/gmktool already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /workspace/builds/worker-6/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=allow" "-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" "+8810c24b0958114d8dbb32d878444e8956fce80f" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e8b56a1409a5b7d5af65e36fef36bb0b292b5f8a5d6278247a79fbea23c0d3a2
[INFO] running `"docker" "start" "-a" "e8b56a1409a5b7d5af65e36fef36bb0b292b5f8a5d6278247a79fbea23c0d3a2"`
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking rgmk v0.2.0
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/rgmk-0.2.0/src/lib.rs:17:1
[INFO] [stderr]    |
[INFO] [stderr] 17 | #![feature(read_exact, associated_consts)]
[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 `rgmk`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e8b56a1409a5b7d5af65e36fef36bb0b292b5f8a5d6278247a79fbea23c0d3a2"`
[INFO] running `"docker" "rm" "-f" "e8b56a1409a5b7d5af65e36fef36bb0b292b5f8a5d6278247a79fbea23c0d3a2"`
[INFO] [stdout] e8b56a1409a5b7d5af65e36fef36bb0b292b5f8a5d6278247a79fbea23c0d3a2