[INFO] crate async-trait 0.1.5 is already in cache
[INFO] extracting crate async-trait 0.1.5 into work/ex/beta-1.38-1/sources/1.37.0/reg/async-trait/0.1.5
[INFO] extracting crate async-trait 0.1.5 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/async-trait/0.1.5
[INFO] validating manifest of async-trait-0.1.5 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 async-trait-0.1.5 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 async-trait-0.1.5
[INFO] finished frobbing async-trait-0.1.5
[INFO] frobbed toml for async-trait-0.1.5 written to work/ex/beta-1.38-1/sources/1.37.0/reg/async-trait/0.1.5/Cargo.toml
[INFO] started frobbing async-trait-0.1.5
[INFO] finished frobbing async-trait-0.1.5
[INFO] frobbed toml for async-trait-0.1.5 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/async-trait/0.1.5/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 async-trait-0.1.5 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/async-trait/0.1.5:/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] 25b418dc822375e2eda54537716b526830a3c2492b13b71475f57b7d1d58436f
[INFO] running `"docker" "start" "-a" "25b418dc822375e2eda54537716b526830a3c2492b13b71475f57b7d1d58436f"`
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling async-trait v0.1.5 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.53s
[INFO] running `"docker" "inspect" "25b418dc822375e2eda54537716b526830a3c2492b13b71475f57b7d1d58436f"`
[INFO] running `"docker" "rm" "-f" "25b418dc822375e2eda54537716b526830a3c2492b13b71475f57b7d1d58436f"`
[INFO] [stdout] 25b418dc822375e2eda54537716b526830a3c2492b13b71475f57b7d1d58436f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/async-trait/0.1.5:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 807ad8048fe064d63107c2efcdc5c39631a59be83e170da7d9ead34b25fff679
[INFO] running `"docker" "start" "-a" "807ad8048fe064d63107c2efcdc5c39631a59be83e170da7d9ead34b25fff679"`
[INFO] [stderr]    Compiling async-trait v0.1.5 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> tests/test.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(async_await)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0271]: type mismatch resolving `<impl std::future::Future as std::future::Future>::Output == <Struct as Trait>::Assoc`
[INFO] [stderr]   --> tests/test.rs:42:1
[INFO] [stderr]    |
[INFO] [stderr] 42 | #[async_trait]
[INFO] [stderr]    | ^^^^^^^^^^^^^^ expected (), found associated type
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected type `()`
[INFO] [stderr]               found type `<Struct as Trait>::Assoc`
[INFO] [stderr]    = note: the return type of a function must have a statically known size
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0271, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0271`.
[INFO] [stderr] error: Could not compile `async-trait`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "807ad8048fe064d63107c2efcdc5c39631a59be83e170da7d9ead34b25fff679"`
[INFO] running `"docker" "rm" "-f" "807ad8048fe064d63107c2efcdc5c39631a59be83e170da7d9ead34b25fff679"`
[INFO] [stdout] 807ad8048fe064d63107c2efcdc5c39631a59be83e170da7d9ead34b25fff679