[INFO] updating cached repository meh/shrooms
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/meh/shrooms
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/meh/shrooms" "work/ex/beta-1.38-1/sources/1.37.0/gh/meh/shrooms"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/meh/shrooms'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/meh/shrooms" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meh/shrooms"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meh/shrooms'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4b3de36750be8d17cbc25b09da6a00fe51fb9772
[INFO] sha for GitHub repo meh/shrooms: 4b3de36750be8d17cbc25b09da6a00fe51fb9772
[INFO] validating manifest of meh/shrooms 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 meh/shrooms 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 meh/shrooms
[INFO] finished frobbing meh/shrooms
[INFO] frobbed toml for meh/shrooms written to work/ex/beta-1.38-1/sources/1.37.0/gh/meh/shrooms/Cargo.toml
[INFO] started frobbing meh/shrooms
[INFO] finished frobbing meh/shrooms
[INFO] frobbed toml for meh/shrooms written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/meh/shrooms/Cargo.toml
[INFO] crate meh/shrooms already has a lockfile, it will not be regenerated
[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 meh/shrooms against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/meh/shrooms:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 3300c2c9128925cd151aed127778e9380c5c3dc1a4b2f36a0a732526ae5916bb
[INFO] running `"docker" "start" "-a" "3300c2c9128925cd151aed127778e9380c5c3dc1a4b2f36a0a732526ae5916bb"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling shrooms v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(collections)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/crypt/x86_64.rs:345:40
[INFO] [stderr]     |
[INFO] [stderr] 345 |                 l ^= sba(&salt.sb[0], &salt.sb[1], (s >> 48)         );
[INFO] [stderr]     |                                                    ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/crypt/x86_64.rs:352:40
[INFO] [stderr]     |
[INFO] [stderr] 352 |                 r ^= sba(&salt.sb[0], &salt.sb[1], (s >> 48)         );
[INFO] [stderr]     |                                                    ^^^^^^^^^ help: remove these parentheses
[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 `shrooms`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3300c2c9128925cd151aed127778e9380c5c3dc1a4b2f36a0a732526ae5916bb"`
[INFO] running `"docker" "rm" "-f" "3300c2c9128925cd151aed127778e9380c5c3dc1a4b2f36a0a732526ae5916bb"`
[INFO] [stdout] 3300c2c9128925cd151aed127778e9380c5c3dc1a4b2f36a0a732526ae5916bb