[INFO] updating cached repository max-frai/three-set-compare-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/max-frai/three-set-compare-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/max-frai/three-set-compare-rs" "work/ex/beta-1.37-6/sources/1.36.0/gh/max-frai/three-set-compare-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/max-frai/three-set-compare-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/max-frai/three-set-compare-rs" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/max-frai/three-set-compare-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/max-frai/three-set-compare-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 04039d7650fd71d38b8c29598f291e30805123f4
[INFO] sha for GitHub repo max-frai/three-set-compare-rs: 04039d7650fd71d38b8c29598f291e30805123f4
[INFO] validating manifest of max-frai/three-set-compare-rs 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 max-frai/three-set-compare-rs 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 max-frai/three-set-compare-rs
[INFO] finished frobbing max-frai/three-set-compare-rs
[INFO] frobbed toml for max-frai/three-set-compare-rs written to work/ex/beta-1.37-6/sources/1.36.0/gh/max-frai/three-set-compare-rs/Cargo.toml
[INFO] started frobbing max-frai/three-set-compare-rs
[INFO] finished frobbing max-frai/three-set-compare-rs
[INFO] frobbed toml for max-frai/three-set-compare-rs written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/max-frai/three-set-compare-rs/Cargo.toml
[INFO] crate max-frai/three-set-compare-rs 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/max-frai/three-set-compare-rs/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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 max-frai/three-set-compare-rs 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-0/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/max-frai/three-set-compare-rs:/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] 6193f11235a6da5c7e58c92d7ab2c4d741fe063ca350989cb616130a22fdb2e6
[INFO] running `"docker" "start" "-a" "6193f11235a6da5c7e58c92d7ab2c4d741fe063ca350989cb616130a22fdb2e6"`
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling hashbrown v0.1.8
[INFO] [stderr]    Compiling three-set-compare v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[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 `three-set-compare`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "6193f11235a6da5c7e58c92d7ab2c4d741fe063ca350989cb616130a22fdb2e6"`
[INFO] running `"docker" "rm" "-f" "6193f11235a6da5c7e58c92d7ab2c4d741fe063ca350989cb616130a22fdb2e6"`
[INFO] [stdout] 6193f11235a6da5c7e58c92d7ab2c4d741fe063ca350989cb616130a22fdb2e6