[INFO] crate debug_sat 0.4.0 is already in cache
[INFO] testing debug_sat-0.4.0 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate debug_sat 0.4.0 into work/builds/worker-2/source
[INFO] validating manifest of crates.io crate debug_sat 0.4.0 on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate debug_sat 0.4.0
[INFO] finished tweaking crates.io crate debug_sat 0.4.0
[INFO] tweaked toml for crates.io crate debug_sat 0.4.0 written to work/builds/worker-2/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 7dad6fc09795d888883c232164c2513ce6b087d66047a1cdb255c2bd1eccc65b
[INFO] running `"docker" "start" "-a" "7dad6fc09795d888883c232164c2513ce6b087d66047a1cdb255c2bd1eccc65b"`
[INFO] [stderr]    Compiling debug_sat v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.50s
[INFO] running `"docker" "inspect" "7dad6fc09795d888883c232164c2513ce6b087d66047a1cdb255c2bd1eccc65b"`
[INFO] running `"docker" "rm" "-f" "7dad6fc09795d888883c232164c2513ce6b087d66047a1cdb255c2bd1eccc65b"`
[INFO] [stdout] 7dad6fc09795d888883c232164c2513ce6b087d66047a1cdb255c2bd1eccc65b
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "test" "--frozen" "--no-run"`
[INFO] [stdout] eb15128d1f864bc22ddbc66f033816564881518fbef4e3725f1943b653843923
[INFO] running `"docker" "start" "-a" "eb15128d1f864bc22ddbc66f033816564881518fbef4e3725f1943b653843923"`
[INFO] [stderr]    Compiling debug_sat v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]    --> src/lib.rs:115:19
[INFO] [stderr]     |
[INFO] [stderr] 115 | #![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 `debug_sat`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "eb15128d1f864bc22ddbc66f033816564881518fbef4e3725f1943b653843923"`
[INFO] running `"docker" "rm" "-f" "eb15128d1f864bc22ddbc66f033816564881518fbef4e3725f1943b653843923"`
[INFO] [stdout] eb15128d1f864bc22ddbc66f033816564881518fbef4e3725f1943b653843923