[INFO] updating cached repository duncanfinney/advent-of-rust-2018
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/duncanfinney/advent-of-rust-2018
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/duncanfinney/advent-of-rust-2018" "work/ex/beta-1.38-1/sources/1.37.0/gh/duncanfinney/advent-of-rust-2018"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/duncanfinney/advent-of-rust-2018'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/duncanfinney/advent-of-rust-2018" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/duncanfinney/advent-of-rust-2018"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/duncanfinney/advent-of-rust-2018'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6e58a2aae16f0391fc521a3bf9b0fdcf3901c2f7
[INFO] sha for GitHub repo duncanfinney/advent-of-rust-2018: 6e58a2aae16f0391fc521a3bf9b0fdcf3901c2f7
[INFO] validating manifest of duncanfinney/advent-of-rust-2018 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of duncanfinney/advent-of-rust-2018 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing duncanfinney/advent-of-rust-2018
[INFO] finished frobbing duncanfinney/advent-of-rust-2018
[INFO] frobbed toml for duncanfinney/advent-of-rust-2018 written to work/ex/beta-1.38-1/sources/1.37.0/gh/duncanfinney/advent-of-rust-2018/Cargo.toml
[INFO] started frobbing duncanfinney/advent-of-rust-2018
[INFO] finished frobbing duncanfinney/advent-of-rust-2018
[INFO] frobbed toml for duncanfinney/advent-of-rust-2018 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/duncanfinney/advent-of-rust-2018/Cargo.toml
[INFO] crate duncanfinney/advent-of-rust-2018 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing duncanfinney/advent-of-rust-2018 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/duncanfinney/advent-of-rust-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 5105355f1434eb00d83a9b6635a0d41c68b020888ddf3a98c95faa4e6d8b9714
[INFO] running `"docker" "start" "-a" "5105355f1434eb00d83a9b6635a0d41c68b020888ddf3a98c95faa4e6d8b9714"`
[INFO] [stderr]    Compiling snowflake v1.3.0
[INFO] [stderr]    Compiling lock_api v0.1.5
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling bytes v0.4.11
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling id_tree v1.3.0
[INFO] [stderr]    Compiling parking_lot v0.6.4
[INFO] [stderr]    Compiling once_cell v0.1.6
[INFO] [stderr]    Compiling cached v0.8.0
[INFO] [stderr]    Compiling advent-of-rust-2018 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_patterns, duration_as_u128, type_ascription)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `itertools::Itertools`
[INFO] [stderr]  --> src/day14.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use itertools::Itertools;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[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 `advent-of-rust-2018`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5105355f1434eb00d83a9b6635a0d41c68b020888ddf3a98c95faa4e6d8b9714"`
[INFO] running `"docker" "rm" "-f" "5105355f1434eb00d83a9b6635a0d41c68b020888ddf3a98c95faa4e6d8b9714"`
[INFO] [stdout] 5105355f1434eb00d83a9b6635a0d41c68b020888ddf3a98c95faa4e6d8b9714