[INFO] crate hexchat 0.6.2 is already in cache
[INFO] extracting crate hexchat 0.6.2 into work/ex/beta-1.37-6/sources/1.36.0/reg/hexchat/0.6.2
[INFO] extracting crate hexchat 0.6.2 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/hexchat/0.6.2
[INFO] validating manifest of hexchat-0.6.2 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 hexchat-0.6.2 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 hexchat-0.6.2
[INFO] finished frobbing hexchat-0.6.2
[INFO] frobbed toml for hexchat-0.6.2 written to work/ex/beta-1.37-6/sources/1.36.0/reg/hexchat/0.6.2/Cargo.toml
[INFO] started frobbing hexchat-0.6.2
[INFO] finished frobbing hexchat-0.6.2
[INFO] frobbed toml for hexchat-0.6.2 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/hexchat/0.6.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 hexchat-0.6.2 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-5/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/hexchat/0.6.2:/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] baefa6fe065097c9289da4acab71fc36a972bb3050e03e22469138a99e425f83
[INFO] running `"docker" "start" "-a" "baefa6fe065097c9289da4acab71fc36a972bb3050e03e22469138a99e425f83"`
[INFO] [stderr]    Compiling charsets v0.2.0
[INFO] [stderr]    Compiling lock_api v0.1.5
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/lock_api-0.1.5/src/lib.rs:88:34
[INFO] [stderr]    |
[INFO] [stderr] 88 | #![cfg_attr(feature = "nightly", feature(const_fn))]
[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 `lock_api`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "baefa6fe065097c9289da4acab71fc36a972bb3050e03e22469138a99e425f83"`
[INFO] running `"docker" "rm" "-f" "baefa6fe065097c9289da4acab71fc36a972bb3050e03e22469138a99e425f83"`
[INFO] [stdout] baefa6fe065097c9289da4acab71fc36a972bb3050e03e22469138a99e425f83