Aug 02 13:49:19.938 INFO checking brain-rs-0.1.0 against 1.27.2 for lazy_static-1
Aug 02 13:49:19.939 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 13:49:19.939 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 13:49:19.939 INFO running `"docker" "create" "-v" "/tmp/crater.5lUlnSI4VyKo:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2:/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 13:49:20.241 INFO blam! 9b36f9d8f07df72a5975f94869f17a344ca16c71e731d766da843848f1903bff
Aug 02 13:49:20.241 INFO running `"docker" "start" "-a" "9b36f9d8f07df72a5975f94869f17a344ca16c71e731d766da843848f1903bff"`
Aug 02 13:49:21.695 INFO kablam!     Checking brain-rs v0.1.0 (file:///source)
Aug 02 13:49:26.023 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 13:49:26.023 INFO kablam!  --> benches/bench_brain.rs:1:1
Aug 02 13:49:26.023 INFO kablam!   |
Aug 02 13:49:26.023 INFO kablam! 1 | #![feature(test)]
Aug 02 13:49:26.023 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 13:49:26.023 INFO kablam! 
Aug 02 13:49:26.024 INFO kablam! error: aborting due to previous error
Aug 02 13:49:26.024 INFO kablam! 
Aug 02 13:49:26.024 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 13:49:26.065 INFO kablam! error: Could not compile `brain-rs`.
Aug 02 13:49:26.066 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 13:49:26.833 INFO kablam! error: build failed
Aug 02 13:49:26.835 INFO kablam! su: No module specific data is present
Aug 02 13:49:27.655 INFO running `"docker" "rm" "-f" "9b36f9d8f07df72a5975f94869f17a344ca16c71e731d766da843848f1903bff"`
Aug 02 13:49:27.850 INFO blam! 9b36f9d8f07df72a5975f94869f17a344ca16c71e731d766da843848f1903bff