[INFO] crate oasis-game-contract 0.9.1 is already in cache
[INFO] extracting crate oasis-game-contract 0.9.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/oasis-game-contract/0.9.1
[INFO] extracting crate oasis-game-contract 0.9.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/oasis-game-contract/0.9.1
[INFO] validating manifest of oasis-game-contract-0.9.1 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 oasis-game-contract-0.9.1 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 oasis-game-contract-0.9.1
[INFO] finished frobbing oasis-game-contract-0.9.1
[INFO] frobbed toml for oasis-game-contract-0.9.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/oasis-game-contract/0.9.1/Cargo.toml
[INFO] started frobbing oasis-game-contract-0.9.1
[INFO] finished frobbing oasis-game-contract-0.9.1
[INFO] frobbed toml for oasis-game-contract-0.9.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/oasis-game-contract/0.9.1/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 oasis-game-contract-0.9.1 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/oasis-game-contract/0.9.1:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 18b906ce3a7e3221914c6d378c844ec96ef9ff13756a00ee90902ecb76f53013
[INFO] running `"docker" "start" "-a" "18b906ce3a7e3221914c6d378c844ec96ef9ff13756a00ee90902ecb76f53013"`
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]    Compiling rustc-hex v2.0.1
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling uint v0.3.0
[INFO] [stderr]    Compiling uint v0.4.1
[INFO] [stderr]    Compiling bigint v4.4.1
[INFO] [stderr]    Compiling parity-hash v1.2.2
[INFO] [stderr]    Compiling oasis-game-core v0.9.0
[INFO] [stderr]    Compiling owasm-std v0.13.0
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/owasm-std-0.13.0/src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(lang_items)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/owasm-std-0.13.0/src/lib.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | #![feature(link_args)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/owasm-std-0.13.0/src/lib.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(alloc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/owasm-std-0.13.0/src/lib.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(core_intrinsics)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/owasm-std-0.13.0/src/lib.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(panic_info_message)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `owasm-std`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "18b906ce3a7e3221914c6d378c844ec96ef9ff13756a00ee90902ecb76f53013"`
[INFO] running `"docker" "rm" "-f" "18b906ce3a7e3221914c6d378c844ec96ef9ff13756a00ee90902ecb76f53013"`
[INFO] [stdout] 18b906ce3a7e3221914c6d378c844ec96ef9ff13756a00ee90902ecb76f53013