Aug 02 03:58:48.144 INFO checking munkres-0.4.0 against 1.27.2 for lazy_static-1
Aug 02 03:58:48.144 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 03:58:48.144 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 03:58:48.145 INFO running `"docker" "create" "-v" "/tmp/crater.jeKEa8V0SbSs:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-6/1.27.2:/target:rw,Z" "-v" "/home/ec2-user/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/home/ec2-user/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-v" "/home/ec2-user/crater/./work/local/cargo-home/git:/cargo-home/git:rw,Z" "-e" "USER_ID=500" "-e" "CMD=cargo +1.27.2 check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "crater"`
Aug 02 03:58:48.306 INFO blam! 235d337e5dd13a187923933b4c2ba372752628d5f627e858a15db6eb358b20fc
Aug 02 03:58:48.308 INFO running `"docker" "start" "-a" "235d337e5dd13a187923933b4c2ba372752628d5f627e858a15db6eb358b20fc"`
Aug 02 03:58:49.861 INFO kablam!     Checking munkres v0.4.0 (file:///source)
Aug 02 03:58:50.450 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 03:58:50.450 INFO kablam!  --> src/lib.rs:1:19
Aug 02 03:58:50.450 INFO kablam!   |
Aug 02 03:58:50.450 INFO kablam! 1 | #![cfg_attr(test, feature(test))]
Aug 02 03:58:50.450 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 03:58:50.450 INFO kablam! 
Aug 02 03:58:50.456 INFO kablam! error: aborting due to previous error
Aug 02 03:58:50.456 INFO kablam! 
Aug 02 03:58:50.456 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 03:58:50.470 INFO kablam! error: Could not compile `munkres`.
Aug 02 03:58:50.470 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 03:58:50.759 INFO kablam! error: build failed
Aug 02 03:58:50.761 INFO kablam! su: No module specific data is present
Aug 02 03:58:51.397 INFO running `"docker" "rm" "-f" "235d337e5dd13a187923933b4c2ba372752628d5f627e858a15db6eb358b20fc"`
Aug 02 03:58:51.512 INFO blam! 235d337e5dd13a187923933b4c2ba372752628d5f627e858a15db6eb358b20fc