[INFO] crate alloc_counter 0.0.2 is already in cache
[INFO] extracting crate alloc_counter 0.0.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/alloc_counter/0.0.2
[INFO] extracting crate alloc_counter 0.0.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/alloc_counter/0.0.2
[INFO] validating manifest of alloc_counter-0.0.2 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 alloc_counter-0.0.2 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 alloc_counter-0.0.2
[INFO] finished frobbing alloc_counter-0.0.2
[INFO] frobbed toml for alloc_counter-0.0.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/alloc_counter/0.0.2/Cargo.toml
[INFO] started frobbing alloc_counter-0.0.2
[INFO] finished frobbing alloc_counter-0.0.2
[INFO] frobbed toml for alloc_counter-0.0.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/alloc_counter/0.0.2/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 alloc_counter-0.0.2 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/alloc_counter/0.0.2:/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] 6a4be49c9af458b9b4693565ea955881c6842258930770d802eddfe41e763a19
[INFO] running `"docker" "start" "-a" "6a4be49c9af458b9b4693565ea955881c6842258930770d802eddfe41e763a19"`
[INFO] [stderr]    Compiling alloc_counter_macro v0.0.1
[INFO] [stderr]    Compiling alloc_counter v0.0.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.40s
[INFO] running `"docker" "inspect" "6a4be49c9af458b9b4693565ea955881c6842258930770d802eddfe41e763a19"`
[INFO] running `"docker" "rm" "-f" "6a4be49c9af458b9b4693565ea955881c6842258930770d802eddfe41e763a19"`
[INFO] [stdout] 6a4be49c9af458b9b4693565ea955881c6842258930770d802eddfe41e763a19
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/alloc_counter/0.0.2:/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] 51ef5820d994eb01f79c1ba2550ed1d286d62d5e33fb1f952885e02bed48e9c5
[INFO] running `"docker" "start" "-a" "51ef5820d994eb01f79c1ba2550ed1d286d62d5e33fb1f952885e02bed48e9c5"`
[INFO] [stderr]    Compiling alloc_counter v0.0.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> tests/futures.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(futures_api, async_await, await_macro, generators, generator_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0727]: `async` generators are not yet supported
[INFO] [stderr]   --> tests/futures.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     #[no_alloc]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `alloc_counter`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "51ef5820d994eb01f79c1ba2550ed1d286d62d5e33fb1f952885e02bed48e9c5"`
[INFO] running `"docker" "rm" "-f" "51ef5820d994eb01f79c1ba2550ed1d286d62d5e33fb1f952885e02bed48e9c5"`
[INFO] [stdout] 51ef5820d994eb01f79c1ba2550ed1d286d62d5e33fb1f952885e02bed48e9c5