[INFO] crate decimate 0.2.2 is already in cache
[INFO] extracting crate decimate 0.2.2 into work/ex/beta-1.37-6/sources/1.36.0/reg/decimate/0.2.2
[INFO] extracting crate decimate 0.2.2 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/decimate/0.2.2
[INFO] validating manifest of decimate-0.2.2 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 decimate-0.2.2 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 decimate-0.2.2
[INFO] finished frobbing decimate-0.2.2
[INFO] frobbed toml for decimate-0.2.2 written to work/ex/beta-1.37-6/sources/1.36.0/reg/decimate/0.2.2/Cargo.toml
[INFO] started frobbing decimate-0.2.2
[INFO] finished frobbing decimate-0.2.2
[INFO] frobbed toml for decimate-0.2.2 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/decimate/0.2.2/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 decimate-0.2.2 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-7/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/decimate/0.2.2:/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] a3480f6a52dafabc0c77d6d89a3c59dee98d49e6f9b967b46d3bbb4c8577fb08
[INFO] running `"docker" "start" "-a" "a3480f6a52dafabc0c77d6d89a3c59dee98d49e6f9b967b46d3bbb4c8577fb08"`
[INFO] [stderr]    Compiling decimate v0.2.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:26:1
[INFO] [stderr]    |
[INFO] [stderr] 26 | #![feature(test)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_left_matches': superseded by `trim_start_matches`
[INFO] [stderr]    --> src/lib.rs:251:32
[INFO] [stderr]     |
[INFO] [stderr] 251 |         let positive = trimmed.trim_left_matches('-');
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated item: `trim_start_matches`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(deprecated)] 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 `decimate`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a3480f6a52dafabc0c77d6d89a3c59dee98d49e6f9b967b46d3bbb4c8577fb08"`
[INFO] running `"docker" "rm" "-f" "a3480f6a52dafabc0c77d6d89a3c59dee98d49e6f9b967b46d3bbb4c8577fb08"`
[INFO] [stdout] a3480f6a52dafabc0c77d6d89a3c59dee98d49e6f9b967b46d3bbb4c8577fb08