[INFO] crate ws_stream_wasm 0.2.1 is already in cache
[INFO] testing ws_stream_wasm-0.2.1 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate ws_stream_wasm 0.2.1 into work/builds/worker-10/source
[INFO] validating manifest of crates.io crate ws_stream_wasm 0.2.1 on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate ws_stream_wasm 0.2.1
[INFO] finished tweaking crates.io crate ws_stream_wasm 0.2.1
[INFO] tweaked toml for crates.io crate ws_stream_wasm 0.2.1 written to work/builds/worker-10/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.1
[INFO] [stderr]   Downloaded naja_async_runtime v0.3.2
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] d4391d418a485973d40c8f0da4b674d38109a9d9d7f886b5129dca32758fd3bc
[INFO] running `"docker" "start" "-a" "d4391d418a485973d40c8f0da4b674d38109a9d9d7f886b5129dca32758fd3bc"`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling sourcefile v0.1.4
[INFO] [stderr]    Compiling once_cell v0.2.4
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.51
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling weedle v0.10.0
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.51
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.51
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.51
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling naja_async_runtime v0.3.2
[INFO] [stderr]    Compiling pharos v0.2.2
[INFO] [stderr]    Compiling wasm-bindgen v0.2.51
[INFO] [stderr]    Compiling js-sys v0.3.28
[INFO] [stderr]    Compiling web-sys v0.3.28
[INFO] [stderr]    Compiling ws_stream_wasm v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]    --> src/lib.rs:164:1
[INFO] [stderr]     |
[INFO] [stderr] 164 | #![ feature( async_await                                      ) ]
[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 `ws_stream_wasm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d4391d418a485973d40c8f0da4b674d38109a9d9d7f886b5129dca32758fd3bc"`
[INFO] running `"docker" "rm" "-f" "d4391d418a485973d40c8f0da4b674d38109a9d9d7f886b5129dca32758fd3bc"`
[INFO] [stdout] d4391d418a485973d40c8f0da4b674d38109a9d9d7f886b5129dca32758fd3bc