Aug 01 21:07:12.754 INFO checking sudoku-0.6.2 against 1.27.2+tmplazy for lazy_static-1
Aug 01 21:07:12.754 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:07:12.754 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:07:12.754 INFO running `"docker" "create" "-v" "/tmp/crater.A7yDnwLZTQhb:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-2/1.27.2+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 21:07:12.995 INFO blam! d14fa2f286a862e3804b07a1e926c5ca470f9e0851615a581f44f68997fd008f
Aug 01 21:07:12.997 INFO running `"docker" "start" "-a" "d14fa2f286a862e3804b07a1e926c5ca470f9e0851615a581f44f68997fd008f"`
Aug 01 21:07:14.027 INFO kablam!     Checking sudoku v0.6.2 (file:///source)
Aug 01 21:07:16.683 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 21:07:16.684 INFO kablam!  --> benches/lib.rs:1:1
Aug 01 21:07:16.684 INFO kablam!   |
Aug 01 21:07:16.684 INFO kablam! 1 | #![feature(test)]
Aug 01 21:07:16.684 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 01 21:07:16.684 INFO kablam! 
Aug 01 21:07:16.684 INFO kablam! error: aborting due to previous error
Aug 01 21:07:16.684 INFO kablam! 
Aug 01 21:07:16.684 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 21:07:16.690 INFO kablam! error: Could not compile `sudoku`.
Aug 01 21:07:16.691 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 21:07:17.191 INFO kablam! error: build failed
Aug 01 21:07:17.197 INFO kablam! su: No module specific data is present
Aug 01 21:07:17.762 INFO running `"docker" "rm" "-f" "d14fa2f286a862e3804b07a1e926c5ca470f9e0851615a581f44f68997fd008f"`
Aug 01 21:07:17.913 INFO blam! d14fa2f286a862e3804b07a1e926c5ca470f9e0851615a581f44f68997fd008f