Aug 02 04:19:23.225 INFO checking mio-0.6.15 against 1.27.2 for lazy_static-1
Aug 02 04:19:23.225 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:19:23.225 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:19:23.226 INFO running `"docker" "create" "-v" "/tmp/crater.wejPU6eya4Jk:/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 04:19:23.586 INFO blam! 6124758a7eace8121fb3854d7ed5f67166780b0bb26af39d2cf9ba234a2590ee
Aug 02 04:19:23.589 INFO running `"docker" "start" "-a" "6124758a7eace8121fb3854d7ed5f67166780b0bb26af39d2cf9ba234a2590ee"`
Aug 02 04:19:26.927 INFO kablam!     Checking mio v0.6.15 (file:///source)
Aug 02 04:19:32.228 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 04:19:32.228 INFO kablam!  --> benches/bench_poll.rs:1:1
Aug 02 04:19:32.228 INFO kablam!   |
Aug 02 04:19:32.228 INFO kablam! 1 | #![feature(test)]
Aug 02 04:19:32.228 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 04:19:32.228 INFO kablam! 
Aug 02 04:19:32.228 INFO kablam! error: aborting due to previous error
Aug 02 04:19:32.228 INFO kablam! 
Aug 02 04:19:32.228 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 04:19:32.235 INFO kablam! error: Could not compile `mio`.
Aug 02 04:19:32.236 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 04:19:40.418 INFO kablam! error: build failed
Aug 02 04:19:40.420 INFO kablam! su: No module specific data is present
Aug 02 04:19:41.290 INFO running `"docker" "rm" "-f" "6124758a7eace8121fb3854d7ed5f67166780b0bb26af39d2cf9ba234a2590ee"`
Aug 02 04:19:41.456 INFO blam! 6124758a7eace8121fb3854d7ed5f67166780b0bb26af39d2cf9ba234a2590ee