[INFO] fetching crate async-trait 0.1.5...
[INFO] extracting crate async-trait 0.1.5 into work/ex/beta-1.37-6/sources/1.36.0/reg/async-trait/0.1.5
[INFO] extracting crate async-trait 0.1.5 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/async-trait/0.1.5
[INFO] validating manifest of async-trait-0.1.5 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 async-trait-0.1.5 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 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-1.37-6/sources/1.36.0/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-1.37-6/sources/beta-2019-07-23/reg/async-trait/0.1.5/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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing async-trait-0.1.5 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 9531554f068f4fabf20a68c06d8bb31f233d8094783b1f94c13a91d545fcf29f
[INFO] running `"docker" "start" "-a" "9531554f068f4fabf20a68c06d8bb31f233d8094783b1f94c13a91d545fcf29f"`
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling async-trait v0.1.5 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.88s
[INFO] running `"docker" "inspect" "9531554f068f4fabf20a68c06d8bb31f233d8094783b1f94c13a91d545fcf29f"`
[INFO] running `"docker" "rm" "-f" "9531554f068f4fabf20a68c06d8bb31f233d8094783b1f94c13a91d545fcf29f"`
[INFO] [stdout] 9531554f068f4fabf20a68c06d8bb31f233d8094783b1f94c13a91d545fcf29f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] f5877ed84d4a71e35a8afe6a79b461a4808b72d80b39786f7dff4ac9d7cc1b9f
[INFO] running `"docker" "start" "-a" "f5877ed84d4a71e35a8afe6a79b461a4808b72d80b39786f7dff4ac9d7cc1b9f"`
[INFO] [stderr]    Compiling async-trait v0.1.5 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta 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" "f5877ed84d4a71e35a8afe6a79b461a4808b72d80b39786f7dff4ac9d7cc1b9f"`
[INFO] running `"docker" "rm" "-f" "f5877ed84d4a71e35a8afe6a79b461a4808b72d80b39786f7dff4ac9d7cc1b9f"`
[INFO] [stdout] f5877ed84d4a71e35a8afe6a79b461a4808b72d80b39786f7dff4ac9d7cc1b9f