Dec 03 01:25:29.428 INFO testing monotonic_solver-0.2.1 against 1.30.1 for beta-1.31-5
Dec 03 01:25:29.428 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-7/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/beta-1.31-5/1.30.1:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +1.30.1 build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 03 01:25:30.248 INFO [stdout] 063db8b876df4fb70bc9445b1e80f6c505e0cc7de2757d5f63426822c59ef724
Dec 03 01:25:30.251 INFO running `"docker" "start" "-a" "063db8b876df4fb70bc9445b1e80f6c505e0cc7de2757d5f63426822c59ef724"`
Dec 03 01:25:31.347 INFO [stderr] usermod: no changes
Dec 03 01:25:31.396 INFO [stderr]    Compiling monotonic_solver v0.2.1 (/source)
Dec 03 01:25:32.280 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.90s
Dec 03 01:25:32.300 INFO [stderr] su: No module specific data is present
Dec 03 01:25:32.792 INFO running `"docker" "inspect" "063db8b876df4fb70bc9445b1e80f6c505e0cc7de2757d5f63426822c59ef724"`
Dec 03 01:25:33.165 INFO running `"docker" "rm" "-f" "063db8b876df4fb70bc9445b1e80f6c505e0cc7de2757d5f63426822c59ef724"`
Dec 03 01:25:33.535 INFO [stdout] 063db8b876df4fb70bc9445b1e80f6c505e0cc7de2757d5f63426822c59ef724
Dec 03 01:25:33.541 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-7/1.30.1:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-7/beta-1.31-5/1.30.1:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +1.30.1 test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 03 01:25:34.080 INFO [stdout] 8984c59379b44bc3694ce9ae9a2e7f7279c39ef2974cd52987bad3b70a83980d
Dec 03 01:25:34.085 INFO running `"docker" "start" "-a" "8984c59379b44bc3694ce9ae9a2e7f7279c39ef2974cd52987bad3b70a83980d"`
Dec 03 01:25:35.392 INFO [stderr] usermod: no changes
Dec 03 01:25:35.435 INFO [stderr]    Compiling monotonic_solver v0.2.1 (/source)
Dec 03 01:25:36.483 INFO [stderr] error[E0554]: #![feature] may not be used on the stable release channel
Dec 03 01:25:36.483 INFO [stderr]  --> examples/drama.rs:1:1
Dec 03 01:25:36.484 INFO [stderr]   |
Dec 03 01:25:36.484 INFO [stderr] 1 | #![feature(box_patterns)]
Dec 03 01:25:36.484 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 03 01:25:36.484 INFO [stderr] 
Dec 03 01:25:36.485 INFO [stderr] error: aborting due to previous error
Dec 03 01:25:36.485 INFO [stderr] 
Dec 03 01:25:36.485 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 03 01:25:36.511 INFO [stderr] error: Could not compile `monotonic_solver`.
Dec 03 01:25:36.512 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 03 01:25:38.226 INFO [stderr] error: build failed
Dec 03 01:25:38.227 INFO [stderr] su: No module specific data is present
Dec 03 01:25:39.441 INFO running `"docker" "inspect" "8984c59379b44bc3694ce9ae9a2e7f7279c39ef2974cd52987bad3b70a83980d"`
Dec 03 01:25:39.671 INFO running `"docker" "rm" "-f" "8984c59379b44bc3694ce9ae9a2e7f7279c39ef2974cd52987bad3b70a83980d"`
Dec 03 01:25:40.043 INFO [stdout] 8984c59379b44bc3694ce9ae9a2e7f7279c39ef2974cd52987bad3b70a83980d