[INFO] updating cached repository mich101mich/aoc-2018
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mich101mich/aoc-2018
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mich101mich/aoc-2018" "work/ex/beta-1.37-6/sources/1.36.0/gh/mich101mich/aoc-2018"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/mich101mich/aoc-2018'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mich101mich/aoc-2018" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mich101mich/aoc-2018"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mich101mich/aoc-2018'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 09c1be865ad2e177b30dc8e3f0b957efb94398e8
[INFO] sha for GitHub repo mich101mich/aoc-2018: 09c1be865ad2e177b30dc8e3f0b957efb94398e8
[INFO] validating manifest of mich101mich/aoc-2018 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mich101mich/aoc-2018 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mich101mich/aoc-2018
[INFO] finished frobbing mich101mich/aoc-2018
[INFO] frobbed toml for mich101mich/aoc-2018 written to work/ex/beta-1.37-6/sources/1.36.0/gh/mich101mich/aoc-2018/Cargo.toml
[INFO] started frobbing mich101mich/aoc-2018
[INFO] finished frobbing mich101mich/aoc-2018
[INFO] frobbed toml for mich101mich/aoc-2018 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/mich101mich/aoc-2018/Cargo.toml
[INFO] crate mich101mich/aoc-2018 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mich101mich/aoc-2018 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/mich101mich/aoc-2018:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] fda46938947cfe17585279696ba33d9016fce8ed3ebe1d0305a509728d84f7ac
[INFO] running `"docker" "start" "-a" "fda46938947cfe17585279696ba33d9016fce8ed3ebe1d0305a509728d84f7ac"`
[INFO] [stderr]    Compiling aoc-2018 v0.1.0 (/opt/crater/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(vec_remove_item)]
[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 `aoc-2018`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "fda46938947cfe17585279696ba33d9016fce8ed3ebe1d0305a509728d84f7ac"`
[INFO] running `"docker" "rm" "-f" "fda46938947cfe17585279696ba33d9016fce8ed3ebe1d0305a509728d84f7ac"`
[INFO] [stdout] fda46938947cfe17585279696ba33d9016fce8ed3ebe1d0305a509728d84f7ac