[INFO] crate stm32f446-hal 0.0.1 is already in cache
[INFO] extracting crate stm32f446-hal 0.0.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/stm32f446-hal/0.0.1
[INFO] extracting crate stm32f446-hal 0.0.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/stm32f446-hal/0.0.1
[INFO] validating manifest of stm32f446-hal-0.0.1 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 stm32f446-hal-0.0.1 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 stm32f446-hal-0.0.1
[INFO] finished frobbing stm32f446-hal-0.0.1
[INFO] frobbed toml for stm32f446-hal-0.0.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/stm32f446-hal/0.0.1/Cargo.toml
[INFO] started frobbing stm32f446-hal-0.0.1
[INFO] finished frobbing stm32f446-hal-0.0.1
[INFO] frobbed toml for stm32f446-hal-0.0.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/stm32f446-hal/0.0.1/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 stm32f446-hal-0.0.1 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/stm32f446-hal/0.0.1:/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] a995d5c35d700e441b655fa10cc50626f101f5b5261301256f32ecab96bc74ed
[INFO] running `"docker" "start" "-a" "a995d5c35d700e441b655fa10cc50626f101f5b5261301256f32ecab96bc74ed"`
[INFO] [stderr]    Compiling stm32f4 v0.2.3
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/stm32f4-0.2.3/src/lib.rs:20:1
[INFO] [stderr]    |
[INFO] [stderr] 20 | #![feature(const_fn)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/stm32f4-0.2.3/src/lib.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | #![feature(try_from)]
[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 `stm32f4`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a995d5c35d700e441b655fa10cc50626f101f5b5261301256f32ecab96bc74ed"`
[INFO] running `"docker" "rm" "-f" "a995d5c35d700e441b655fa10cc50626f101f5b5261301256f32ecab96bc74ed"`
[INFO] [stdout] a995d5c35d700e441b655fa10cc50626f101f5b5261301256f32ecab96bc74ed