Aug 02 13:59:22.147 INFO checking blake2b-0.7.0 against 1.27.2 for lazy_static-1
Aug 02 13:59:22.147 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 13:59:22.147 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 13:59:22.147 INFO running `"docker" "create" "-v" "/tmp/crater.nzwwTAhXIAqj:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-5/1.27.2:/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 13:59:22.575 INFO blam! 1218931559b4945ff7c435c17abc23bf3cd0588d9b8d3c762c203b89dda99291
Aug 02 13:59:22.577 INFO running `"docker" "start" "-a" "1218931559b4945ff7c435c17abc23bf3cd0588d9b8d3c762c203b89dda99291"`
Aug 02 13:59:23.693 INFO kablam!     Checking blake2b v0.7.0 (file:///source)
Aug 02 13:59:26.029 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 13:59:26.029 INFO kablam!  --> benches/benches.rs:1:1
Aug 02 13:59:26.029 INFO kablam!   |
Aug 02 13:59:26.029 INFO kablam! 1 | #![feature(test)]
Aug 02 13:59:26.029 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 13:59:26.029 INFO kablam! 
Aug 02 13:59:26.029 INFO kablam! error: aborting due to previous error
Aug 02 13:59:26.030 INFO kablam! 
Aug 02 13:59:26.030 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 13:59:26.043 INFO kablam! error: Could not compile `blake2b`.
Aug 02 13:59:26.043 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 13:59:26.473 INFO kablam! error: build failed
Aug 02 13:59:26.475 INFO kablam! su: No module specific data is present
Aug 02 13:59:27.138 INFO running `"docker" "rm" "-f" "1218931559b4945ff7c435c17abc23bf3cd0588d9b8d3c762c203b89dda99291"`
Aug 02 13:59:27.299 INFO blam! 1218931559b4945ff7c435c17abc23bf3cd0588d9b8d3c762c203b89dda99291