Aug 02 07:27:33.347 INFO checking hamt-rs-0.3.0 against 1.27.2 for lazy_static-1
Aug 02 07:27:33.347 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 07:27:33.347 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 07:27:33.347 INFO running `"docker" "create" "-v" "/tmp/crater.LTedlqOHpDrE:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-3/1.27.2:/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 07:27:33.568 INFO blam! ba3a4db8eb6fd8b597f681e17358b950493e1130f6afb9b0bb55df88964418bb
Aug 02 07:27:33.569 INFO running `"docker" "start" "-a" "ba3a4db8eb6fd8b597f681e17358b950493e1130f6afb9b0bb55df88964418bb"`
Aug 02 07:27:34.490 INFO kablam!     Checking hamt-rs v0.3.0 (file:///source)
Aug 02 07:27:37.944 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 07:27:37.944 INFO kablam!   --> benches/benches.rs:21:1
Aug 02 07:27:37.944 INFO kablam!    |
Aug 02 07:27:37.944 INFO kablam! 21 | #![feature(test)]
Aug 02 07:27:37.944 INFO kablam!    | ^^^^^^^^^^^^^^^^^
Aug 02 07:27:37.944 INFO kablam! 
Aug 02 07:27:37.945 INFO kablam! error: aborting due to previous error
Aug 02 07:27:37.945 INFO kablam! 
Aug 02 07:27:37.945 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 07:27:37.951 INFO kablam! error: Could not compile `hamt-rs`.
Aug 02 07:27:37.951 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 07:27:38.488 INFO kablam! error: build failed
Aug 02 07:27:38.490 INFO kablam! su: No module specific data is present
Aug 02 07:27:39.087 INFO running `"docker" "rm" "-f" "ba3a4db8eb6fd8b597f681e17358b950493e1130f6afb9b0bb55df88964418bb"`
Aug 02 07:27:39.243 INFO blam! ba3a4db8eb6fd8b597f681e17358b950493e1130f6afb9b0bb55df88964418bb