Aug 02 14:34:37.826 INFO checking atomic_immut-0.1.4 against 1.27.2 for lazy_static-1
Aug 02 14:34:37.826 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 14:34:37.826 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 14:34:37.826 INFO running `"docker" "create" "-v" "/tmp/crater.IMXRB1ug7jhi:/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 14:34:38.125 INFO blam! 55d950ab81173070559a104ae4a4afb5354b57b8c46e6e3e5c8082106cda64f2
Aug 02 14:34:38.126 INFO running `"docker" "start" "-a" "55d950ab81173070559a104ae4a4afb5354b57b8c46e6e3e5c8082106cda64f2"`
Aug 02 14:34:39.434 INFO kablam!     Checking atomic_immut v0.1.4 (file:///source)
Aug 02 14:34:40.609 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 14:34:40.610 INFO kablam!  --> benches/lib.rs:2:1
Aug 02 14:34:40.610 INFO kablam!   |
Aug 02 14:34:40.610 INFO kablam! 2 | #![feature(test)]
Aug 02 14:34:40.610 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 14:34:40.610 INFO kablam! 
Aug 02 14:34:40.610 INFO kablam! error: aborting due to previous error
Aug 02 14:34:40.610 INFO kablam! 
Aug 02 14:34:40.610 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 14:34:40.617 INFO kablam! error: Could not compile `atomic_immut`.
Aug 02 14:34:40.617 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 14:34:40.722 INFO kablam! error: build failed
Aug 02 14:34:40.723 INFO kablam! su: No module specific data is present
Aug 02 14:34:41.904 INFO running `"docker" "rm" "-f" "55d950ab81173070559a104ae4a4afb5354b57b8c46e6e3e5c8082106cda64f2"`
Aug 02 14:34:42.010 INFO blam! 55d950ab81173070559a104ae4a4afb5354b57b8c46e6e3e5c8082106cda64f2