Aug 02 04:34:12.680 INFO checking md4-0.7.0 against 1.27.2 for lazy_static-1
Aug 02 04:34:12.680 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:34:12.680 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:34:12.680 INFO running `"docker" "create" "-v" "/tmp/crater.hsynCT3S9etk:/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 04:34:12.959 INFO blam! 1ec39ec20db3f470b94a7fa5bb371167cda2f87822d0a8364cc96c1f47aa4eb0
Aug 02 04:34:12.972 INFO running `"docker" "start" "-a" "1ec39ec20db3f470b94a7fa5bb371167cda2f87822d0a8364cc96c1f47aa4eb0"`
Aug 02 04:34:13.926 INFO kablam!     Checking md4 v0.7.0 (file:///source)
Aug 02 04:34:16.476 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 04:34:16.476 INFO kablam!  --> benches/lib.rs:2:1
Aug 02 04:34:16.476 INFO kablam!   |
Aug 02 04:34:16.476 INFO kablam! 2 | #![feature(test)]
Aug 02 04:34:16.477 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 04:34:16.477 INFO kablam! 
Aug 02 04:34:16.480 INFO kablam! error: aborting due to previous error
Aug 02 04:34:16.480 INFO kablam! 
Aug 02 04:34:16.480 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 04:34:16.498 INFO kablam! error: Could not compile `md4`.
Aug 02 04:34:16.498 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 04:34:16.745 INFO kablam! error: build failed
Aug 02 04:34:16.747 INFO kablam! su: No module specific data is present
Aug 02 04:34:17.414 INFO running `"docker" "rm" "-f" "1ec39ec20db3f470b94a7fa5bb371167cda2f87822d0a8364cc96c1f47aa4eb0"`
Aug 02 04:34:17.565 INFO blam! 1ec39ec20db3f470b94a7fa5bb371167cda2f87822d0a8364cc96c1f47aa4eb0