[INFO] crate core-midi 0.1.1 is already in cache
[INFO] extracting crate core-midi 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/core-midi/0.1.1
[INFO] extracting crate core-midi 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/core-midi/0.1.1
[INFO] validating manifest of core-midi-0.1.1 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 core-midi-0.1.1 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 core-midi-0.1.1
[INFO] finished frobbing core-midi-0.1.1
[INFO] frobbed toml for core-midi-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/core-midi/0.1.1/Cargo.toml
[INFO] started frobbing core-midi-0.1.1
[INFO] finished frobbing core-midi-0.1.1
[INFO] frobbed toml for core-midi-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/core-midi/0.1.1/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 core-midi-0.1.1 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-4/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/core-midi/0.1.1:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 5980d008e048b6e72ac281121e961c9edbda6384d113745bb4d7952c921fc27c
[INFO] running `"docker" "start" "-a" "5980d008e048b6e72ac281121e961c9edbda6384d113745bb4d7952c921fc27c"`
[INFO] [stderr]    Compiling core-foundation-sys v0.2.3
[INFO] [stderr] error: native frameworks are only available on macOS targets
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `core-foundation-sys`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5980d008e048b6e72ac281121e961c9edbda6384d113745bb4d7952c921fc27c"`
[INFO] running `"docker" "rm" "-f" "5980d008e048b6e72ac281121e961c9edbda6384d113745bb4d7952c921fc27c"`
[INFO] [stdout] 5980d008e048b6e72ac281121e961c9edbda6384d113745bb4d7952c921fc27c