[INFO] crate futures-await-test-preview 0.3.0-alpha.16 is already in cache
[INFO] extracting crate futures-await-test-preview 0.3.0-alpha.16 into work/ex/beta-1.37-6/sources/1.36.0/reg/futures-await-test-preview/0.3.0-alpha.16
[INFO] extracting crate futures-await-test-preview 0.3.0-alpha.16 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/futures-await-test-preview/0.3.0-alpha.16
[INFO] validating manifest of futures-await-test-preview-0.3.0-alpha.16 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 futures-await-test-preview-0.3.0-alpha.16 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 futures-await-test-preview-0.3.0-alpha.16
[INFO] finished frobbing futures-await-test-preview-0.3.0-alpha.16
[INFO] frobbed toml for futures-await-test-preview-0.3.0-alpha.16 written to work/ex/beta-1.37-6/sources/1.36.0/reg/futures-await-test-preview/0.3.0-alpha.16/Cargo.toml
[INFO] started frobbing futures-await-test-preview-0.3.0-alpha.16
[INFO] finished frobbing futures-await-test-preview-0.3.0-alpha.16
[INFO] frobbed toml for futures-await-test-preview-0.3.0-alpha.16 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/futures-await-test-preview/0.3.0-alpha.16/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 futures-await-test-preview-0.3.0-alpha.16 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-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/futures-await-test-preview/0.3.0-alpha.16:/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] 0a0bb5e8614ac157186b1c9188e774b4e678b32387a2d6fd7ff03d7f96e8f05c
[INFO] running `"docker" "start" "-a" "0a0bb5e8614ac157186b1c9188e774b4e678b32387a2d6fd7ff03d7f96e8f05c"`
[INFO] [stderr]    Compiling syn v0.15.42
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling futures-await-test-macro-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling futures-await-test-preview v0.3.0-alpha.16 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.85s
[INFO] running `"docker" "inspect" "0a0bb5e8614ac157186b1c9188e774b4e678b32387a2d6fd7ff03d7f96e8f05c"`
[INFO] running `"docker" "rm" "-f" "0a0bb5e8614ac157186b1c9188e774b4e678b32387a2d6fd7ff03d7f96e8f05c"`
[INFO] [stdout] 0a0bb5e8614ac157186b1c9188e774b4e678b32387a2d6fd7ff03d7f96e8f05c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/futures-await-test-preview/0.3.0-alpha.16:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 7c262f79aba85991441f60d83c9cb0078a847fe6853af52d794c03366947a09c
[INFO] running `"docker" "start" "-a" "7c262f79aba85991441f60d83c9cb0078a847fe6853af52d794c03366947a09c"`
[INFO] [stderr]    Compiling futures-await-test-preview v0.3.0-alpha.16 (/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: 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-await-test-preview`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "7c262f79aba85991441f60d83c9cb0078a847fe6853af52d794c03366947a09c"`
[INFO] running `"docker" "rm" "-f" "7c262f79aba85991441f60d83c9cb0078a847fe6853af52d794c03366947a09c"`
[INFO] [stdout] 7c262f79aba85991441f60d83c9cb0078a847fe6853af52d794c03366947a09c