Aug 01 18:19:31.446 INFO checking yard-0.2.5 against 1.27.2 for lazy_static-1
Aug 01 18:19:31.446 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 18:19:31.446 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 18:19:31.446 INFO running `"docker" "create" "-v" "/tmp/crater.mmRj7CHmrLNG:/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 01 18:19:31.670 INFO blam! 8e6be8c81df79f23b8f0157875f5fad601f831bc0610d3d98e768a7a9167ff8f
Aug 01 18:19:31.673 INFO running `"docker" "start" "-a" "8e6be8c81df79f23b8f0157875f5fad601f831bc0610d3d98e768a7a9167ff8f"`
Aug 01 18:19:32.491 INFO kablam!     Checking yard v0.2.5 (file:///source)
Aug 01 18:19:34.008 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 18:19:34.034 INFO kablam!  --> benches/shunting_yard_bench.rs:1:1
Aug 01 18:19:34.034 INFO kablam!   |
Aug 01 18:19:34.034 INFO kablam! 1 | #![feature(test)]
Aug 01 18:19:34.034 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 01 18:19:34.034 INFO kablam! 
Aug 01 18:19:34.034 INFO kablam! error: aborting due to previous error
Aug 01 18:19:34.034 INFO kablam! 
Aug 01 18:19:34.034 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 18:19:34.034 INFO kablam! error: Could not compile `yard`.
Aug 01 18:19:34.034 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 18:19:34.665 INFO kablam! error: build failed
Aug 01 18:19:34.668 INFO kablam! su: No module specific data is present
Aug 01 18:19:35.358 INFO running `"docker" "rm" "-f" "8e6be8c81df79f23b8f0157875f5fad601f831bc0610d3d98e768a7a9167ff8f"`
Aug 01 18:19:35.517 INFO blam! 8e6be8c81df79f23b8f0157875f5fad601f831bc0610d3d98e768a7a9167ff8f