[INFO] crate raw-syscall-enumerated 0.7.6 is already in cache
[INFO] extracting crate raw-syscall-enumerated 0.7.6 into work/ex/beta-1.38-1/sources/1.37.0/reg/raw-syscall-enumerated/0.7.6
[INFO] extracting crate raw-syscall-enumerated 0.7.6 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/raw-syscall-enumerated/0.7.6
[INFO] validating manifest of raw-syscall-enumerated-0.7.6 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 raw-syscall-enumerated-0.7.6 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 raw-syscall-enumerated-0.7.6
[INFO] finished frobbing raw-syscall-enumerated-0.7.6
[INFO] frobbed toml for raw-syscall-enumerated-0.7.6 written to work/ex/beta-1.38-1/sources/1.37.0/reg/raw-syscall-enumerated/0.7.6/Cargo.toml
[INFO] started frobbing raw-syscall-enumerated-0.7.6
[INFO] finished frobbing raw-syscall-enumerated-0.7.6
[INFO] frobbed toml for raw-syscall-enumerated-0.7.6 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/raw-syscall-enumerated/0.7.6/Cargo.toml
[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 raw-syscall-enumerated-0.7.6 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/raw-syscall-enumerated/0.7.6:/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] b19843d19a6596a14b63c05ee3e3fb4991407afb76798f53582c06a4f7e8fde3
[INFO] running `"docker" "start" "-a" "b19843d19a6596a14b63c05ee3e3fb4991407afb76798f53582c06a4f7e8fde3"`
[INFO] [stderr]    Compiling raw-syscall-base v0.7.6
[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/raw-syscall-base-0.7.6/src/lib.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![feature(asm)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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/raw-syscall-base-0.7.6/src/lib.rs:22:1
[INFO] [stderr]    |
[INFO] [stderr] 22 | #![feature(tool_lints)]
[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 `raw-syscall-base`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b19843d19a6596a14b63c05ee3e3fb4991407afb76798f53582c06a4f7e8fde3"`
[INFO] running `"docker" "rm" "-f" "b19843d19a6596a14b63c05ee3e3fb4991407afb76798f53582c06a4f7e8fde3"`
[INFO] [stdout] b19843d19a6596a14b63c05ee3e3fb4991407afb76798f53582c06a4f7e8fde3