Aug 01 23:24:12.209 INFO checking rustfft-2.0.0 against 1.27.2 for lazy_static-1
Aug 01 23:24:12.209 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:24:12.209 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:24:12.209 INFO running `"docker" "create" "-v" "/tmp/crater.A0RGrEujQK8W:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-4/1.27.2:/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 01 23:24:12.467 INFO blam! ad91954aeb93640bdaf300d70173677076f154cdd2e9af86d65fff586e289dda
Aug 01 23:24:12.470 INFO running `"docker" "start" "-a" "ad91954aeb93640bdaf300d70173677076f154cdd2e9af86d65fff586e289dda"`
Aug 01 23:24:13.402 INFO kablam!     Checking rustfft v2.0.0 (file:///source)
Aug 01 23:24:18.491 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 23:24:18.491 INFO kablam!  --> benches/rustfft.rs:1:1
Aug 01 23:24:18.491 INFO kablam!   |
Aug 01 23:24:18.491 INFO kablam! 1 | #![feature(test)]
Aug 01 23:24:18.491 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 01 23:24:18.491 INFO kablam! 
Aug 01 23:24:18.491 INFO kablam! error: aborting due to previous error
Aug 01 23:24:18.492 INFO kablam! 
Aug 01 23:24:18.492 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 23:24:18.504 INFO kablam! error: Could not compile `rustfft`.
Aug 01 23:24:18.504 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 23:24:19.114 INFO kablam! error: build failed
Aug 01 23:24:19.115 INFO kablam! su: No module specific data is present
Aug 01 23:24:19.706 INFO running `"docker" "rm" "-f" "ad91954aeb93640bdaf300d70173677076f154cdd2e9af86d65fff586e289dda"`
Aug 01 23:24:19.849 INFO blam! ad91954aeb93640bdaf300d70173677076f154cdd2e9af86d65fff586e289dda