Aug 01 22:05:45.482 INFO checking skiplist-0.2.10 against 1.27.2+tmplazy for lazy_static-1
Aug 01 22:05:45.482 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 22:05:45.482 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 22:05:45.482 INFO running `"docker" "create" "-v" "/tmp/crater.TjKtCvqbBHDt:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-3/1.27.2+tmplazy:/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 01 22:05:45.755 INFO blam! d987ce833781230630477a3f4ba17673464c654d5c3033cb3b8f925359553a52
Aug 01 22:05:45.757 INFO running `"docker" "start" "-a" "d987ce833781230630477a3f4ba17673464c654d5c3033cb3b8f925359553a52"`
Aug 01 22:05:46.887 INFO kablam!     Checking skiplist v0.2.10 (file:///source)
Aug 01 22:05:47.904 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 22:05:47.904 INFO kablam!   --> src/lib.rs:27:19
Aug 01 22:05:47.904 INFO kablam!    |
Aug 01 22:05:47.904 INFO kablam! 27 | #![cfg_attr(test, feature(test, collections_bound))]
Aug 01 22:05:47.905 INFO kablam!    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 01 22:05:47.905 INFO kablam! 
Aug 01 22:05:47.930 INFO kablam! error: aborting due to previous error
Aug 01 22:05:47.930 INFO kablam! 
Aug 01 22:05:47.930 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 22:05:47.941 INFO kablam! error: Could not compile `skiplist`.
Aug 01 22:05:47.941 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 22:05:50.022 INFO kablam! error: build failed
Aug 01 22:05:50.024 INFO kablam! su: No module specific data is present
Aug 01 22:05:50.607 INFO running `"docker" "rm" "-f" "d987ce833781230630477a3f4ba17673464c654d5c3033cb3b8f925359553a52"`
Aug 01 22:05:50.799 INFO blam! d987ce833781230630477a3f4ba17673464c654d5c3033cb3b8f925359553a52