[INFO] crate cemu-smm 4.0.7 is already in cache
[INFO] extracting crate cemu-smm 4.0.7 into work/ex/beta-1.38-1/sources/1.37.0/reg/cemu-smm/4.0.7
[INFO] extracting crate cemu-smm 4.0.7 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cemu-smm/4.0.7
[INFO] validating manifest of cemu-smm-4.0.7 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 cemu-smm-4.0.7 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 cemu-smm-4.0.7
[INFO] finished frobbing cemu-smm-4.0.7
[INFO] frobbed toml for cemu-smm-4.0.7 written to work/ex/beta-1.38-1/sources/1.37.0/reg/cemu-smm/4.0.7/Cargo.toml
[INFO] started frobbing cemu-smm-4.0.7
[INFO] finished frobbing cemu-smm-4.0.7
[INFO] frobbed toml for cemu-smm-4.0.7 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cemu-smm/4.0.7/Cargo.toml
[INFO] crate cemu-smm-4.0.7 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 cemu-smm-4.0.7 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/cemu-smm/4.0.7:/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] e936ed42d0b735d3f468473e6821e0b837938f3321906bb71ac2f42c6d1961be
[INFO] running `"docker" "start" "-a" "e936ed42d0b735d3f468473e6821e0b837938f3321906bb71ac2f42c6d1961be"`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling serde v1.0.95
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.48
[INFO] [stderr]    Compiling bumpalo v2.5.0
[INFO] [stderr]    Compiling protobuf v2.7.0
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]    Compiling wasm-bindgen v0.2.48
[INFO] [stderr]    Compiling sourcefile v0.1.4
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]    Compiling nom v2.2.1
[INFO] [stderr]    Compiling libflate v0.1.25
[INFO] [stderr]    Compiling weedle v0.10.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[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/regex-1.1.9/src/lib.rs:523:34
[INFO] [stderr]     |
[INFO] [stderr] 523 | #![cfg_attr(feature = "pattern", feature(pattern))]
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.30
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling time v0.1.42
[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 `regex`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "e936ed42d0b735d3f468473e6821e0b837938f3321906bb71ac2f42c6d1961be"`
[INFO] running `"docker" "rm" "-f" "e936ed42d0b735d3f468473e6821e0b837938f3321906bb71ac2f42c6d1961be"`
[INFO] [stdout] e936ed42d0b735d3f468473e6821e0b837938f3321906bb71ac2f42c6d1961be