[INFO] crate squark-web 0.3.0 is already in cache
[INFO] extracting crate squark-web 0.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/squark-web/0.3.0
[INFO] extracting crate squark-web 0.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/squark-web/0.3.0
[INFO] validating manifest of squark-web-0.3.0 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 squark-web-0.3.0 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 squark-web-0.3.0
[INFO] finished frobbing squark-web-0.3.0
[INFO] frobbed toml for squark-web-0.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/squark-web/0.3.0/Cargo.toml
[INFO] started frobbing squark-web-0.3.0
[INFO] finished frobbing squark-web-0.3.0
[INFO] frobbed toml for squark-web-0.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/squark-web/0.3.0/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 squark-web-0.3.0 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-7/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/squark-web/0.3.0:/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] b202b40b456a0f97f9df7dea4110ee0de7b7ebd77eb74442650d9b9530b86d69
[INFO] running `"docker" "start" "-a" "b202b40b456a0f97f9df7dea4110ee0de7b7ebd77eb74442650d9b9530b86d69"`
[INFO] [stderr]    Compiling bumpalo v2.6.0
[INFO] [stderr]    Compiling wasm-bindgen v0.2.50
[INFO] [stderr]    Compiling sourcefile v0.1.4
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.50
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rustc-hash v1.0.1
[INFO] [stderr]    Compiling syn v1.0.3
[INFO] [stderr]    Compiling weedle v0.10.0
[INFO] [stderr]    Compiling squark v0.7.1
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.50
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.50
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.50
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.50
[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/wasm-bindgen-0.2.50/src/lib.rs:10:34
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![cfg_attr(feature = "nightly", feature(unsize))]
[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 `wasm-bindgen`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "b202b40b456a0f97f9df7dea4110ee0de7b7ebd77eb74442650d9b9530b86d69"`
[INFO] running `"docker" "rm" "-f" "b202b40b456a0f97f9df7dea4110ee0de7b7ebd77eb74442650d9b9530b86d69"`
[INFO] [stdout] b202b40b456a0f97f9df7dea4110ee0de7b7ebd77eb74442650d9b9530b86d69