[INFO] updating cached repository josephlr/rust-aoc
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/josephlr/rust-aoc
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/josephlr/rust-aoc" "work/ex/beta-1.37-6/sources/1.36.0/gh/josephlr/rust-aoc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/josephlr/rust-aoc'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/josephlr/rust-aoc" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/josephlr/rust-aoc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/josephlr/rust-aoc'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2a2cfb653e80c78a3fb31635bcf8150d38dca939
[INFO] sha for GitHub repo josephlr/rust-aoc: 2a2cfb653e80c78a3fb31635bcf8150d38dca939
[INFO] validating manifest of josephlr/rust-aoc 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 josephlr/rust-aoc 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 josephlr/rust-aoc
[INFO] finished frobbing josephlr/rust-aoc
[INFO] frobbed toml for josephlr/rust-aoc written to work/ex/beta-1.37-6/sources/1.36.0/gh/josephlr/rust-aoc/Cargo.toml
[INFO] started frobbing josephlr/rust-aoc
[INFO] finished frobbing josephlr/rust-aoc
[INFO] frobbed toml for josephlr/rust-aoc written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/josephlr/rust-aoc/Cargo.toml
[INFO] crate josephlr/rust-aoc 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 josephlr/rust-aoc against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/josephlr/rust-aoc:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 1c3d8f0def69a973ad1a5a7578b51e5c268c11d37a660143eaceab0f0c287dd3
[INFO] running `"docker" "start" "-a" "1c3d8f0def69a973ad1a5a7578b51e5c268c11d37a660143eaceab0f0c287dd3"`
[INFO] [stderr]    Compiling bit-vec v0.5.0
[INFO] [stderr]    Compiling intrusive-collections v0.7.8
[INFO] [stderr]    Compiling rust-aoc 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(
[INFO] [stderr] 2  | |     nll,
[INFO] [stderr] 3  | |     never_type,
[INFO] [stderr] 4  | |     specialization,
[INFO] [stderr] ...  |
[INFO] [stderr] 9  | |     try_trait
[INFO] [stderr] 10 | | )]
[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 `rust-aoc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1c3d8f0def69a973ad1a5a7578b51e5c268c11d37a660143eaceab0f0c287dd3"`
[INFO] running `"docker" "rm" "-f" "1c3d8f0def69a973ad1a5a7578b51e5c268c11d37a660143eaceab0f0c287dd3"`
[INFO] [stdout] 1c3d8f0def69a973ad1a5a7578b51e5c268c11d37a660143eaceab0f0c287dd3