[INFO] crate trim_matches_exactly 0.1.0 is already in cache
[INFO] extracting crate trim_matches_exactly 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/trim_matches_exactly/0.1.0
[INFO] extracting crate trim_matches_exactly 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/trim_matches_exactly/0.1.0
[INFO] validating manifest of trim_matches_exactly-0.1.0 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 trim_matches_exactly-0.1.0 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 trim_matches_exactly-0.1.0
[INFO] finished frobbing trim_matches_exactly-0.1.0
[INFO] frobbed toml for trim_matches_exactly-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/trim_matches_exactly/0.1.0/Cargo.toml
[INFO] started frobbing trim_matches_exactly-0.1.0
[INFO] finished frobbing trim_matches_exactly-0.1.0
[INFO] frobbed toml for trim_matches_exactly-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/trim_matches_exactly/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 trim_matches_exactly-0.1.0 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/reg/trim_matches_exactly/0.1.0:/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] 1cf7ea4d8d0062697313ee1db40bd79808f5f555ce6659aed203a280f04eb225
[INFO] running `"docker" "start" "-a" "1cf7ea4d8d0062697313ee1db40bd79808f5f555ce6659aed203a280f04eb225"`
[INFO] [stderr]    Compiling trim_matches_exactly v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(pattern)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::slice_unchecked': use `get_unchecked(begin..end)` instead
[INFO] [stderr]   --> src/lib.rs:68:21
[INFO] [stderr]    |
[INFO] [stderr] 68 |             Ok(self.slice_unchecked(trim_idx, self.len()))
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::slice_unchecked': use `get_unchecked(begin..end)` instead
[INFO] [stderr]   --> src/lib.rs:84:21
[INFO] [stderr]    |
[INFO] [stderr] 84 |             Ok(self.slice_unchecked(0, trim_idx))
[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 `trim_matches_exactly`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1cf7ea4d8d0062697313ee1db40bd79808f5f555ce6659aed203a280f04eb225"`
[INFO] running `"docker" "rm" "-f" "1cf7ea4d8d0062697313ee1db40bd79808f5f555ce6659aed203a280f04eb225"`
[INFO] [stdout] 1cf7ea4d8d0062697313ee1db40bd79808f5f555ce6659aed203a280f04eb225