[INFO] crate monotonic_solver 0.2.1 is already in cache
[INFO] testing monotonic_solver-0.2.1 against beta-2019-09-28 for beta-1.39-1
[INFO] extracting crate monotonic_solver 0.2.1 into work/builds/worker-6/source
[INFO] validating manifest of crates.io crate monotonic_solver 0.2.1 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 monotonic_solver 0.2.1
[INFO] finished tweaking crates.io crate monotonic_solver 0.2.1
[INFO] tweaked toml for crates.io crate monotonic_solver 0.2.1 written to work/builds/worker-6/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-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] 2b71d2dae3e881b4818df3b9d6add96fbbbd25b733fafdb66c9c34e3db71463d
[INFO] running `"docker" "start" "-a" "2b71d2dae3e881b4818df3b9d6add96fbbbd25b733fafdb66c9c34e3db71463d"`
[INFO] [stderr]    Compiling monotonic_solver v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `"docker" "inspect" "2b71d2dae3e881b4818df3b9d6add96fbbbd25b733fafdb66c9c34e3db71463d"`
[INFO] running `"docker" "rm" "-f" "2b71d2dae3e881b4818df3b9d6add96fbbbd25b733fafdb66c9c34e3db71463d"`
[INFO] [stdout] 2b71d2dae3e881b4818df3b9d6add96fbbbd25b733fafdb66c9c34e3db71463d
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] c8692a34f63c5b0252d0d59ecc4cfd6885bcca0874b46d6567d130242de1622c
[INFO] running `"docker" "start" "-a" "c8692a34f63c5b0252d0d59ecc4cfd6885bcca0874b46d6567d130242de1622c"`
[INFO] [stderr]    Compiling monotonic_solver v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> examples/drama.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(box_patterns)]
[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 `monotonic_solver`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "c8692a34f63c5b0252d0d59ecc4cfd6885bcca0874b46d6567d130242de1622c"`
[INFO] running `"docker" "rm" "-f" "c8692a34f63c5b0252d0d59ecc4cfd6885bcca0874b46d6567d130242de1622c"`
[INFO] [stdout] c8692a34f63c5b0252d0d59ecc4cfd6885bcca0874b46d6567d130242de1622c