[INFO] updating cached repository redox-os/games
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/redox-os/games
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/redox-os/games" "work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/games"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/games'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/redox-os/games" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/games"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/games'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 60c25d65d8b73f4af8bd3eabacf2545dff9a1cbc
[INFO] sha for GitHub repo redox-os/games: 60c25d65d8b73f4af8bd3eabacf2545dff9a1cbc
[INFO] validating manifest of redox-os/games 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 redox-os/games 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 redox-os/games
[INFO] finished frobbing redox-os/games
[INFO] frobbed toml for redox-os/games written to work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/games/Cargo.toml
[INFO] started frobbing redox-os/games
[INFO] finished frobbing redox-os/games
[INFO] frobbed toml for redox-os/games written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/redox-os/games/Cargo.toml
[INFO] crate redox-os/games 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 redox-os/games 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/redox-os/games:/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] f8b84f3d94978a146dcf15cb1bc524cb01bb80143aca4335d10e996508b77896
[INFO] running `"docker" "start" "-a" "f8b84f3d94978a146dcf15cb1bc524cb01bb80143aca4335d10e996508b77896"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling extra v0.1.0 (https://gitlab.redox-os.org/redox-os/libextra.git#0b50f3f2)
[INFO] [stderr]    Compiling termion v1.5.3
[INFO] [stderr]    Compiling libgo v0.1.0
[INFO] [stderr]    Compiling reversi v0.5.0 (https://github.com/EGhiorzi/reversi/#44ca82c6)
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/libextra-eb7dff9aa1632a5a/0b50f3f/src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(const_fn)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/libextra-eb7dff9aa1632a5a/0b50f3f/src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![feature(core_intrinsics)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/libextra-eb7dff9aa1632a5a/0b50f3f/src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(stmt_expr_attributes)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `extra`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "f8b84f3d94978a146dcf15cb1bc524cb01bb80143aca4335d10e996508b77896"`
[INFO] running `"docker" "rm" "-f" "f8b84f3d94978a146dcf15cb1bc524cb01bb80143aca4335d10e996508b77896"`
[INFO] [stdout] f8b84f3d94978a146dcf15cb1bc524cb01bb80143aca4335d10e996508b77896