Aug 02 13:45:46.764 INFO checking buf_redux-0.6.3 against 1.27.2 for lazy_static-1
Aug 02 13:45:46.764 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 13:45:46.764 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 13:45:46.764 INFO running `"docker" "create" "-v" "/tmp/crater.7ULkjGfioNHT:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-3/1.27.2:/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 13:45:46.931 INFO blam! ce3e7de34a69d1e675e0fc2f9973f52888fad02cce223f4bc2b8863b83d56c48
Aug 02 13:45:46.933 INFO running `"docker" "start" "-a" "ce3e7de34a69d1e675e0fc2f9973f52888fad02cce223f4bc2b8863b83d56c48"`
Aug 02 13:45:48.081 INFO kablam!     Checking buf_redux v0.6.3 (file:///source)
Aug 02 13:45:49.135 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 13:45:49.135 INFO kablam!   --> src/lib.rs:65:19
Aug 02 13:45:49.135 INFO kablam!    |
Aug 02 13:45:49.135 INFO kablam! 65 | #![cfg_attr(test, feature(test))]
Aug 02 13:45:49.135 INFO kablam!    |                   ^^^^^^^^^^^^^^
Aug 02 13:45:49.135 INFO kablam! 
Aug 02 13:45:49.143 INFO kablam! error: aborting due to previous error
Aug 02 13:45:49.159 INFO kablam! 
Aug 02 13:45:49.160 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 13:45:49.176 INFO kablam! error: Could not compile `buf_redux`.
Aug 02 13:45:49.176 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 13:45:49.522 INFO kablam! error: build failed
Aug 02 13:45:49.523 INFO kablam! su: No module specific data is present
Aug 02 13:45:50.171 INFO running `"docker" "rm" "-f" "ce3e7de34a69d1e675e0fc2f9973f52888fad02cce223f4bc2b8863b83d56c48"`
Aug 02 13:45:50.324 INFO blam! ce3e7de34a69d1e675e0fc2f9973f52888fad02cce223f4bc2b8863b83d56c48