Aug 01 23:24:11.936 INFO checking rustfft-2.0.0 against 1.27.2+tmplazy for lazy_static-1
Aug 01 23:24:11.936 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:24:11.936 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:24:11.936 INFO running `"docker" "create" "-v" "/tmp/crater.iM3Ij1VXICbu:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2+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 01 23:24:12.235 INFO blam! af8e54817da942f3e0a67c0515912ff4a5fb756a45efc51302a6a5e8120cd2a4
Aug 01 23:24:12.237 INFO running `"docker" "start" "-a" "af8e54817da942f3e0a67c0515912ff4a5fb756a45efc51302a6a5e8120cd2a4"`
Aug 01 23:24:13.141 INFO kablam!     Checking rustfft v2.0.0 (file:///source)
Aug 01 23:24:17.959 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 23:24:17.959 INFO kablam!  --> benches/rustfft.rs:1:1
Aug 01 23:24:17.959 INFO kablam!   |
Aug 01 23:24:17.959 INFO kablam! 1 | #![feature(test)]
Aug 01 23:24:17.959 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 01 23:24:17.960 INFO kablam! 
Aug 01 23:24:17.961 INFO kablam! error: aborting due to previous error
Aug 01 23:24:17.961 INFO kablam! 
Aug 01 23:24:17.962 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 23:24:17.985 INFO kablam! error: Could not compile `rustfft`.
Aug 01 23:24:17.986 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 23:24:19.494 INFO kablam! error: build failed
Aug 01 23:24:19.496 INFO kablam! su: No module specific data is present
Aug 01 23:24:20.178 INFO running `"docker" "rm" "-f" "af8e54817da942f3e0a67c0515912ff4a5fb756a45efc51302a6a5e8120cd2a4"`
Aug 01 23:24:20.334 INFO blam! af8e54817da942f3e0a67c0515912ff4a5fb756a45efc51302a6a5e8120cd2a4