Aug 02 03:48:07.834 INFO checking nbchan-0.1.3 against 1.27.2 for lazy_static-1
Aug 02 03:48:07.834 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 03:48:07.834 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 03:48:07.834 INFO running `"docker" "create" "-v" "/tmp/crater.qQtqZFrtQ7GU:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-1/1.27.2:/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 03:48:08.038 INFO blam! b53f57cd33377110797d676c7c15ceb1333a3e2ff2f345d36eecc8f9ac537fe3
Aug 02 03:48:08.041 INFO running `"docker" "start" "-a" "b53f57cd33377110797d676c7c15ceb1333a3e2ff2f345d36eecc8f9ac537fe3"`
Aug 02 03:48:08.920 INFO kablam!     Checking nbchan v0.1.3 (file:///source)
Aug 02 03:48:10.121 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 03:48:10.121 INFO kablam!  --> benches/lib.rs:2:1
Aug 02 03:48:10.121 INFO kablam!   |
Aug 02 03:48:10.121 INFO kablam! 2 | #![feature(test)]
Aug 02 03:48:10.121 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 03:48:10.122 INFO kablam! 
Aug 02 03:48:10.122 INFO kablam! error: aborting due to previous error
Aug 02 03:48:10.122 INFO kablam! 
Aug 02 03:48:10.122 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 03:48:10.130 INFO kablam! error: Could not compile `nbchan`.
Aug 02 03:48:10.130 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 03:48:10.565 INFO kablam! error: build failed
Aug 02 03:48:10.568 INFO kablam! su: No module specific data is present
Aug 02 03:48:11.186 INFO running `"docker" "rm" "-f" "b53f57cd33377110797d676c7c15ceb1333a3e2ff2f345d36eecc8f9ac537fe3"`
Aug 02 03:48:11.336 INFO blam! b53f57cd33377110797d676c7c15ceb1333a3e2ff2f345d36eecc8f9ac537fe3