[INFO] updating cached repository proudlygeek/emuchip-8
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/proudlygeek/emuchip-8
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/proudlygeek/emuchip-8" "work/ex/beta-1.38-1/sources/1.37.0/gh/proudlygeek/emuchip-8"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/proudlygeek/emuchip-8'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/proudlygeek/emuchip-8" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/proudlygeek/emuchip-8"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/proudlygeek/emuchip-8'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2f6e44576998b85f3dc3454fa50b51f03d33b1f1
[INFO] sha for GitHub repo proudlygeek/emuchip-8: 2f6e44576998b85f3dc3454fa50b51f03d33b1f1
[INFO] validating manifest of proudlygeek/emuchip-8 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 proudlygeek/emuchip-8 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 proudlygeek/emuchip-8
[INFO] finished frobbing proudlygeek/emuchip-8
[INFO] frobbed toml for proudlygeek/emuchip-8 written to work/ex/beta-1.38-1/sources/1.37.0/gh/proudlygeek/emuchip-8/Cargo.toml
[INFO] started frobbing proudlygeek/emuchip-8
[INFO] finished frobbing proudlygeek/emuchip-8
[INFO] frobbed toml for proudlygeek/emuchip-8 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/proudlygeek/emuchip-8/Cargo.toml
[INFO] crate proudlygeek/emuchip-8 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 proudlygeek/emuchip-8 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/proudlygeek/emuchip-8:/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] 69d6c61bc6768bd82e39d2a2a88c182926a0bf841e9980f06e9414bbeddc80f7
[INFO] running `"docker" "start" "-a" "69d6c61bc6768bd82e39d2a2a88c182926a0bf841e9980f06e9414bbeddc80f7"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.25
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.33
[INFO] [stderr]    Compiling libc v0.2.47
[INFO] [stderr]    Compiling wasm-bindgen v0.2.33
[INFO] [stderr]    Compiling sdl2-sys v0.32.5
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_os v0.1.1
[INFO] [stderr]    Compiling rand v0.4.5
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]    Compiling rand v0.6.4
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling sdl2 v0.32.1
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.33
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.33
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.33
[INFO] [stderr]    Compiling wbg-rand v0.4.1
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/wbg-rand-0.4.1/src/lib.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #![feature(use_extern_macros)]
[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 `wbg-rand`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "69d6c61bc6768bd82e39d2a2a88c182926a0bf841e9980f06e9414bbeddc80f7"`
[INFO] running `"docker" "rm" "-f" "69d6c61bc6768bd82e39d2a2a88c182926a0bf841e9980f06e9414bbeddc80f7"`
[INFO] [stdout] 69d6c61bc6768bd82e39d2a2a88c182926a0bf841e9980f06e9414bbeddc80f7