Aug 02 01:51:13.491 INFO checking promising-future-0.2.4 against 1.27.2 for lazy_static-1
Aug 02 01:51:13.491 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:51:13.491 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:51:13.491 INFO running `"docker" "create" "-v" "/tmp/crater.KpQxc5MXeeY3:/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 02 01:51:13.731 INFO blam! 02a96e9e22fb5b1f4ba75c5883f91777086355b4032be8fafb1044a7235a4b7e
Aug 02 01:51:13.734 INFO running `"docker" "start" "-a" "02a96e9e22fb5b1f4ba75c5883f91777086355b4032be8fafb1044a7235a4b7e"`
Aug 02 01:51:15.190 INFO kablam!     Checking promising-future v0.2.4 (file:///source)
Aug 02 01:51:17.577 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 01:51:17.577 INFO kablam!  --> benches/bench.rs:1:1
Aug 02 01:51:17.577 INFO kablam!   |
Aug 02 01:51:17.577 INFO kablam! 1 | #![feature(test)]
Aug 02 01:51:17.577 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 01:51:17.577 INFO kablam! 
Aug 02 01:51:17.578 INFO kablam! error: aborting due to previous error
Aug 02 01:51:17.578 INFO kablam! 
Aug 02 01:51:17.579 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 01:51:17.593 INFO kablam! error: Could not compile `promising-future`.
Aug 02 01:51:17.594 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 01:51:18.795 INFO kablam! error: build failed
Aug 02 01:51:18.803 INFO kablam! su: No module specific data is present
Aug 02 01:51:19.448 INFO running `"docker" "rm" "-f" "02a96e9e22fb5b1f4ba75c5883f91777086355b4032be8fafb1044a7235a4b7e"`
Aug 02 01:51:19.623 INFO blam! 02a96e9e22fb5b1f4ba75c5883f91777086355b4032be8fafb1044a7235a4b7e