Aug 02 11:27:03.372 INFO checking differential-evolution-0.2.2 against 1.27.2 for lazy_static-1
Aug 02 11:27:03.372 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 11:27:03.373 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 11:27:03.373 INFO running `"docker" "create" "-v" "/tmp/crater.Vak0x7ZWc4OM:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-5/1.27.2:/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 11:27:03.730 INFO blam! c2269bef214fa2649cfd292a81190243a294020eb5ef1f6a599a710a9e0607a7
Aug 02 11:27:03.738 INFO running `"docker" "start" "-a" "c2269bef214fa2649cfd292a81190243a294020eb5ef1f6a599a710a9e0607a7"`
Aug 02 11:27:04.886 INFO kablam!     Checking differential-evolution v0.2.2 (file:///source)
Aug 02 11:27:07.831 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 11:27:07.831 INFO kablam!  --> benches/bench.rs:9:1
Aug 02 11:27:07.831 INFO kablam!   |
Aug 02 11:27:07.831 INFO kablam! 9 | #![feature(test)]
Aug 02 11:27:07.831 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 11:27:07.831 INFO kablam! 
Aug 02 11:27:07.831 INFO kablam! error: aborting due to previous error
Aug 02 11:27:07.831 INFO kablam! 
Aug 02 11:27:07.831 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 11:27:07.917 INFO kablam! error: Could not compile `differential-evolution`.
Aug 02 11:27:07.917 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 11:27:08.496 INFO kablam! error: build failed
Aug 02 11:27:08.496 INFO kablam! su: No module specific data is present
Aug 02 11:27:09.210 INFO running `"docker" "rm" "-f" "c2269bef214fa2649cfd292a81190243a294020eb5ef1f6a599a710a9e0607a7"`
Aug 02 11:27:09.382 INFO blam! c2269bef214fa2649cfd292a81190243a294020eb5ef1f6a599a710a9e0607a7