[INFO] crate mac_utun 0.6.0 is already in cache
[INFO] extracting crate mac_utun 0.6.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/mac_utun/0.6.0
[INFO] extracting crate mac_utun 0.6.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mac_utun/0.6.0
[INFO] validating manifest of mac_utun-0.6.0 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 mac_utun-0.6.0 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 mac_utun-0.6.0
[INFO] finished frobbing mac_utun-0.6.0
[INFO] frobbed toml for mac_utun-0.6.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/mac_utun/0.6.0/Cargo.toml
[INFO] started frobbing mac_utun-0.6.0
[INFO] finished frobbing mac_utun-0.6.0
[INFO] frobbed toml for mac_utun-0.6.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mac_utun/0.6.0/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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mac_utun-0.6.0 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/mac_utun/0.6.0:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 94eded66acf235e953f00ae8b13f2ee692371607315de26d0998680f090835ce
[INFO] running `"docker" "start" "-a" "94eded66acf235e953f00ae8b13f2ee692371607315de26d0998680f090835ce"`
[INFO] [stderr]    Compiling mac_utun v0.6.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Error`
[INFO] [stderr]   --> src/lib.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     Err(Error::from(ErrorKind::NotFound))
[INFO] [stderr]    |         ^^^^^ use of undeclared type or module `Error`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `ErrorKind`
[INFO] [stderr]   --> src/lib.rs:25:21
[INFO] [stderr]    |
[INFO] [stderr] 25 |     Err(Error::from(ErrorKind::NotFound))
[INFO] [stderr]    |                     ^^^^^^^^^ use of undeclared type or module `ErrorKind`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::os::unix::io::FromRawFd`
[INFO] [stderr]  --> src/lib.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::os::unix::io::FromRawFd;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `mac_utun`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "94eded66acf235e953f00ae8b13f2ee692371607315de26d0998680f090835ce"`
[INFO] running `"docker" "rm" "-f" "94eded66acf235e953f00ae8b13f2ee692371607315de26d0998680f090835ce"`
[INFO] [stdout] 94eded66acf235e953f00ae8b13f2ee692371607315de26d0998680f090835ce