Aug 02 09:40:22.660 INFO checking fs2-0.4.3 against 1.27.2+tmplazy for lazy_static-1
Aug 02 09:40:22.660 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 09:40:22.660 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 09:40:22.661 INFO running `"docker" "create" "-v" "/tmp/crater.oJIUC3HYMwtU:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-2/1.27.2+tmplazy:/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 09:40:22.840 INFO blam! 035375dba5aa94ddb0bc427f21b84ac7ae90be3caa5b94654072e2c904d83a8c
Aug 02 09:40:22.842 INFO running `"docker" "start" "-a" "035375dba5aa94ddb0bc427f21b84ac7ae90be3caa5b94654072e2c904d83a8c"`
Aug 02 09:40:24.418 INFO kablam!     Checking fs2 v0.4.3 (file:///source)
Aug 02 09:40:24.846 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 09:40:24.846 INFO kablam!  --> src/lib.rs:5:19
Aug 02 09:40:24.846 INFO kablam!   |
Aug 02 09:40:24.846 INFO kablam! 5 | #![cfg_attr(test, feature(test))]
Aug 02 09:40:24.846 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 09:40:24.846 INFO kablam! 
Aug 02 09:40:24.848 INFO kablam! error: aborting due to previous error
Aug 02 09:40:24.848 INFO kablam! 
Aug 02 09:40:24.848 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 09:40:24.855 INFO kablam! error: Could not compile `fs2`.
Aug 02 09:40:24.855 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 09:40:24.895 INFO kablam! error: build failed
Aug 02 09:40:24.896 INFO kablam! su: No module specific data is present
Aug 02 09:40:25.705 INFO running `"docker" "rm" "-f" "035375dba5aa94ddb0bc427f21b84ac7ae90be3caa5b94654072e2c904d83a8c"`
Aug 02 09:40:25.837 INFO blam! 035375dba5aa94ddb0bc427f21b84ac7ae90be3caa5b94654072e2c904d83a8c