Aug 02 00:05:33.734 INFO checking rtrace-1.0.0 against 1.27.2 for lazy_static-1
Aug 02 00:05:33.734 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 00:05:33.734 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 00:05:33.734 INFO running `"docker" "create" "-v" "/tmp/crater.X5zVV6UcXa4f:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-2/1.27.2:/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 00:05:33.964 INFO blam! d760cb097d6d4243738478ab50d5011d878ed587d1b1f3109385afdae2bdb80c
Aug 02 00:05:33.967 INFO running `"docker" "start" "-a" "d760cb097d6d4243738478ab50d5011d878ed587d1b1f3109385afdae2bdb80c"`
Aug 02 00:05:35.187 INFO kablam!     Checking rtrace v1.0.0 (file:///source)
Aug 02 00:05:35.609 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 00:05:35.609 INFO kablam!  --> src/rust/lib.rs:1:19
Aug 02 00:05:35.609 INFO kablam!   |
Aug 02 00:05:35.609 INFO kablam! 1 | #![cfg_attr(test, feature(test))]
Aug 02 00:05:35.609 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 00:05:35.609 INFO kablam! 
Aug 02 00:05:35.612 INFO kablam! error: aborting due to previous error
Aug 02 00:05:35.612 INFO kablam! 
Aug 02 00:05:35.612 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 00:05:35.625 INFO kablam! error: Could not compile `rtrace`.
Aug 02 00:05:35.626 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 00:05:35.972 INFO kablam! error: build failed
Aug 02 00:05:35.974 INFO kablam! su: No module specific data is present
Aug 02 00:05:36.566 INFO running `"docker" "rm" "-f" "d760cb097d6d4243738478ab50d5011d878ed587d1b1f3109385afdae2bdb80c"`
Aug 02 00:05:36.699 INFO blam! d760cb097d6d4243738478ab50d5011d878ed587d1b1f3109385afdae2bdb80c