[INFO] fetching crate facade 0.0.0...
[INFO] extracting crate facade 0.0.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/facade/0.0.0
[INFO] extracting crate facade 0.0.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/facade/0.0.0
[INFO] validating manifest of facade-0.0.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of facade-0.0.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing facade-0.0.0
[INFO] finished frobbing facade-0.0.0
[INFO] frobbed toml for facade-0.0.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/facade/0.0.0/Cargo.toml
[INFO] started frobbing facade-0.0.0
[INFO] finished frobbing facade-0.0.0
[INFO] frobbed toml for facade-0.0.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/facade/0.0.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded facade-protocol v0.1.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing facade-0.0.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/facade/0.0.0:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 5e1c5baf9f3728b3c5e02886e1fca07d5bc83ebfc233c980aff4e65fa9c3ed9a
[INFO] running `"docker" "start" "-a" "5e1c5baf9f3728b3c5e02886e1fca07d5bc83ebfc233c980aff4e65fa9c3ed9a"`
[INFO] [stderr]    Compiling buf_redux v0.8.4
[INFO] [stderr]    Compiling headers-derive v0.1.0
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling tungstenite v0.8.1
[INFO] [stderr]    Compiling bigdecimal v0.1.0
[INFO] [stderr]    Compiling multipart v0.16.1
[INFO] [stderr]    Compiling facade-protocol v0.1.0
[INFO] [stderr]    Compiling headers v0.2.1
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.17
[INFO] [stderr] error: enum variants on type aliases are experimental
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/facade-protocol-0.1.0/src/lib.rs:93:9
[INFO] [stderr]    |
[INFO] [stderr] 93 |         Self::Bind(bind)
[INFO] [stderr]    |         ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: enum variants on type aliases are experimental
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/facade-protocol-0.1.0/src/lib.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |         Self::Control(control)
[INFO] [stderr]    |         ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: enum variants on type aliases are experimental
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/facade-protocol-0.1.0/src/lib.rs:105:9
[INFO] [stderr]     |
[INFO] [stderr] 105 |         Self::Container(Box::new(container))
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `facade-protocol`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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/futures-util-preview-0.3.0-alpha.17/src/lib.rs:4:38
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![cfg_attr(feature = "async-await", 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 `futures-util-preview`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5e1c5baf9f3728b3c5e02886e1fca07d5bc83ebfc233c980aff4e65fa9c3ed9a"`
[INFO] running `"docker" "rm" "-f" "5e1c5baf9f3728b3c5e02886e1fca07d5bc83ebfc233c980aff4e65fa9c3ed9a"`
[INFO] [stdout] 5e1c5baf9f3728b3c5e02886e1fca07d5bc83ebfc233c980aff4e65fa9c3ed9a