Aug 02 13:45:45.949 INFO checking buf_redux-0.6.3 against 1.27.2+tmplazy for lazy_static-1
Aug 02 13:45:45.949 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 13:45:45.949 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 13:45:45.950 INFO running `"docker" "create" "-v" "/tmp/crater.r81KrZLyDYFo:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-4/1.27.2+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 02 13:45:46.270 INFO blam! b2850fc16202c1d2962d10549a9c329fba3b87772ac134e7d77555b35ef424cf
Aug 02 13:45:46.272 INFO running `"docker" "start" "-a" "b2850fc16202c1d2962d10549a9c329fba3b87772ac134e7d77555b35ef424cf"`
Aug 02 13:45:47.769 INFO kablam!     Checking buf_redux v0.6.3 (file:///source)
Aug 02 13:45:48.661 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 13:45:48.661 INFO kablam!   --> src/lib.rs:65:19
Aug 02 13:45:48.661 INFO kablam!    |
Aug 02 13:45:48.661 INFO kablam! 65 | #![cfg_attr(test, feature(test))]
Aug 02 13:45:48.661 INFO kablam!    |                   ^^^^^^^^^^^^^^
Aug 02 13:45:48.661 INFO kablam! 
Aug 02 13:45:48.667 INFO kablam! error: aborting due to previous error
Aug 02 13:45:48.667 INFO kablam! 
Aug 02 13:45:48.667 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 13:45:48.675 INFO kablam! error: Could not compile `buf_redux`.
Aug 02 13:45:48.675 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 13:45:48.972 INFO kablam! error: build failed
Aug 02 13:45:48.977 INFO kablam! su: No module specific data is present
Aug 02 13:45:49.782 INFO running `"docker" "rm" "-f" "b2850fc16202c1d2962d10549a9c329fba3b87772ac134e7d77555b35ef424cf"`
Aug 02 13:45:49.979 INFO blam! b2850fc16202c1d2962d10549a9c329fba3b87772ac134e7d77555b35ef424cf