[INFO] crate paw 1.0.0 is already in cache
[INFO] extracting crate paw 1.0.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/paw/1.0.0
[INFO] extracting crate paw 1.0.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/paw/1.0.0
[INFO] validating manifest of paw-1.0.0 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 paw-1.0.0 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 paw-1.0.0
[INFO] finished frobbing paw-1.0.0
[INFO] frobbed toml for paw-1.0.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/paw/1.0.0/Cargo.toml
[INFO] started frobbing paw-1.0.0
[INFO] finished frobbing paw-1.0.0
[INFO] frobbed toml for paw-1.0.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/paw/1.0.0/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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded runtime v0.3.0-alpha.7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing paw-1.0.0 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-2/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/paw/1.0.0:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 380280f490981a2be970dcbe31a6eb93a93cc998e9811bcb849a578abc6df73e
[INFO] running `"docker" "start" "-a" "380280f490981a2be970dcbe31a6eb93a93cc998e9811bcb849a578abc6df73e"`
[INFO] [stderr]    Compiling paw-raw v1.0.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling paw-attributes v1.0.0
[INFO] [stderr]    Compiling paw v1.0.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 17.09s
[INFO] running `"docker" "inspect" "380280f490981a2be970dcbe31a6eb93a93cc998e9811bcb849a578abc6df73e"`
[INFO] running `"docker" "rm" "-f" "380280f490981a2be970dcbe31a6eb93a93cc998e9811bcb849a578abc6df73e"`
[INFO] [stdout] 380280f490981a2be970dcbe31a6eb93a93cc998e9811bcb849a578abc6df73e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/paw/1.0.0:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 872da9076f4b8556419f0772335b9d127d2c3dfce48841bdc3319d377e073372
[INFO] running `"docker" "start" "-a" "872da9076f4b8556419f0772335b9d127d2c3dfce48841bdc3319d377e073372"`
[INFO] [stderr]    Compiling proc-macro2 v1.0.1
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]    Compiling futures-timer v0.3.0
[INFO] [stderr]    Compiling runtime-raw v0.3.0-alpha.5
[INFO] [stderr]    Compiling romio v0.3.0-alpha.9
[INFO] [stderr]    Compiling juliex v0.3.0-alpha.8
[INFO] [stderr] error[E0658]: async blocks are unstable
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/runtime-raw-0.3.0-alpha.5/src/lib.rs:65:15
[INFO] [stderr]    |
[INFO] [stderr] 65 |       let fut = async move {
[INFO] [stderr]    |  _______________^
[INFO] [stderr] 66 | |         let t = fut.await;
[INFO] [stderr] 67 | |         let _ = tx.send(t);
[INFO] [stderr] 68 | |     };
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: async/await is unstable
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/runtime-raw-0.3.0-alpha.5/src/lib.rs:66:17
[INFO] [stderr]    |
[INFO] [stderr] 66 |         let t = fut.await;
[INFO] [stderr]    |                 ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/50547
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: Could not compile `runtime-raw`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "872da9076f4b8556419f0772335b9d127d2c3dfce48841bdc3319d377e073372"`
[INFO] running `"docker" "rm" "-f" "872da9076f4b8556419f0772335b9d127d2c3dfce48841bdc3319d377e073372"`
[INFO] [stdout] 872da9076f4b8556419f0772335b9d127d2c3dfce48841bdc3319d377e073372