[INFO] crate eng-wasm 0.1.3 is already in cache
[INFO] extracting crate eng-wasm 0.1.3 into work/ex/beta-1.38-1/sources/1.37.0/reg/eng-wasm/0.1.3
[INFO] extracting crate eng-wasm 0.1.3 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/eng-wasm/0.1.3
[INFO] validating manifest of eng-wasm-0.1.3 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 eng-wasm-0.1.3 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 eng-wasm-0.1.3
[INFO] finished frobbing eng-wasm-0.1.3
[INFO] frobbed toml for eng-wasm-0.1.3 written to work/ex/beta-1.38-1/sources/1.37.0/reg/eng-wasm/0.1.3/Cargo.toml
[INFO] started frobbing eng-wasm-0.1.3
[INFO] finished frobbing eng-wasm-0.1.3
[INFO] frobbed toml for eng-wasm-0.1.3 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/eng-wasm/0.1.3/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 eng-wasm-0.1.3 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/eng-wasm/0.1.3:/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] cd2a813a63ddbb9b5be11d08e57681e071da1d473ac1fa4c8600d803bfeab1c8
[INFO] running `"docker" "start" "-a" "cd2a813a63ddbb9b5be11d08e57681e071da1d473ac1fa4c8600d803bfeab1c8"`
[INFO] [stderr]    Compiling rustc-hex v2.0.1
[INFO] [stderr]    Compiling fixed-hash v0.3.2
[INFO] [stderr]    Compiling uint v0.6.1
[INFO] [stderr]    Compiling eng-pwasm-abi v0.3.1
[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/eng-pwasm-abi-0.3.1/src/lib.rs:4:46
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![cfg_attr(not(any(feature = "std", test)), feature(alloc))]
[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 `eng-pwasm-abi`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "cd2a813a63ddbb9b5be11d08e57681e071da1d473ac1fa4c8600d803bfeab1c8"`
[INFO] running `"docker" "rm" "-f" "cd2a813a63ddbb9b5be11d08e57681e071da1d473ac1fa4c8600d803bfeab1c8"`
[INFO] [stdout] cd2a813a63ddbb9b5be11d08e57681e071da1d473ac1fa4c8600d803bfeab1c8