[INFO] crate conduit-mime-types 0.7.3 is already in cache
[INFO] extracting crate conduit-mime-types 0.7.3 into work/ex/beta-1.37-6/sources/1.36.0/reg/conduit-mime-types/0.7.3
[INFO] extracting crate conduit-mime-types 0.7.3 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/conduit-mime-types/0.7.3
[INFO] validating manifest of conduit-mime-types-0.7.3 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 conduit-mime-types-0.7.3 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 conduit-mime-types-0.7.3
[INFO] finished frobbing conduit-mime-types-0.7.3
[INFO] frobbed toml for conduit-mime-types-0.7.3 written to work/ex/beta-1.37-6/sources/1.36.0/reg/conduit-mime-types/0.7.3/Cargo.toml
[INFO] started frobbing conduit-mime-types-0.7.3
[INFO] finished frobbing conduit-mime-types-0.7.3
[INFO] frobbed toml for conduit-mime-types-0.7.3 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/conduit-mime-types/0.7.3/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 conduit-mime-types-0.7.3 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/conduit-mime-types/0.7.3:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 6b286cf4a52ef56b3ef1cc7233e2ac112b86f0178ec2c0cc24ec07a4f47fd142
[INFO] running `"docker" "start" "-a" "6b286cf4a52ef56b3ef1cc7233e2ac112b86f0178ec2c0cc24ec07a4f47fd142"`
[INFO] [stderr]    Compiling conduit-mime-types v0.7.3 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.64s
[INFO] running `"docker" "inspect" "6b286cf4a52ef56b3ef1cc7233e2ac112b86f0178ec2c0cc24ec07a4f47fd142"`
[INFO] running `"docker" "rm" "-f" "6b286cf4a52ef56b3ef1cc7233e2ac112b86f0178ec2c0cc24ec07a4f47fd142"`
[INFO] [stdout] 6b286cf4a52ef56b3ef1cc7233e2ac112b86f0178ec2c0cc24ec07a4f47fd142
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/conduit-mime-types/0.7.3:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 512e6e1fe3a230971be55e3cbcad4db74d3e38378b09c096f77f0ec42ad7f914
[INFO] running `"docker" "start" "-a" "512e6e1fe3a230971be55e3cbcad4db74d3e38378b09c096f77f0ec42ad7f914"`
[INFO] [stderr]    Compiling conduit-mime-types v0.7.3 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:19
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(test, feature(test))]
[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 `conduit-mime-types`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "512e6e1fe3a230971be55e3cbcad4db74d3e38378b09c096f77f0ec42ad7f914"`
[INFO] running `"docker" "rm" "-f" "512e6e1fe3a230971be55e3cbcad4db74d3e38378b09c096f77f0ec42ad7f914"`
[INFO] [stdout] 512e6e1fe3a230971be55e3cbcad4db74d3e38378b09c096f77f0ec42ad7f914