[INFO] updating cached repository Dynisious/interface
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Dynisious/interface
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Dynisious/interface" "work/ex/beta-1.38-1/sources/1.37.0/gh/Dynisious/interface"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Dynisious/interface'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Dynisious/interface" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dynisious/interface"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dynisious/interface'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e8c999422937d7946db8aa90358154ccf0b3bcbb
[INFO] sha for GitHub repo Dynisious/interface: e8c999422937d7946db8aa90358154ccf0b3bcbb
[INFO] validating manifest of Dynisious/interface 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 Dynisious/interface 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 Dynisious/interface
[INFO] finished frobbing Dynisious/interface
[INFO] frobbed toml for Dynisious/interface written to work/ex/beta-1.38-1/sources/1.37.0/gh/Dynisious/interface/Cargo.toml
[INFO] started frobbing Dynisious/interface
[INFO] finished frobbing Dynisious/interface
[INFO] frobbed toml for Dynisious/interface written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dynisious/interface/Cargo.toml
[INFO] crate Dynisious/interface 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Dynisious/interface/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[INFO] the lockfile is outdated, regenerating it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" "+1.37.0" "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 Dynisious/interface 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Dynisious/interface:/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] b468e6a1a2cdf9ddacd5996b4eda3ae0fba2d6a5a37ab3293c6f889a813f5648
[INFO] running `"docker" "start" "-a" "b468e6a1a2cdf9ddacd5996b4eda3ae0fba2d6a5a37ab3293c6f889a813f5648"`
[INFO] [stderr]    Compiling winapi v0.3.7
[INFO] [stderr]    Compiling interface v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(iterator_step_by)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `interface`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b468e6a1a2cdf9ddacd5996b4eda3ae0fba2d6a5a37ab3293c6f889a813f5648"`
[INFO] running `"docker" "rm" "-f" "b468e6a1a2cdf9ddacd5996b4eda3ae0fba2d6a5a37ab3293c6f889a813f5648"`
[INFO] [stdout] b468e6a1a2cdf9ddacd5996b4eda3ae0fba2d6a5a37ab3293c6f889a813f5648