Aug 02 09:40:23.527 INFO checking fs2-0.4.3 against 1.27.2 for lazy_static-1
Aug 02 09:40:23.527 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 09:40:23.527 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 09:40:23.527 INFO running `"docker" "create" "-v" "/tmp/crater.49UGxWI1RuJj:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-6/1.27.2:/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 09:40:23.677 INFO blam! 53ee7b20f9aa032d2026d9f54d97ab67d539a3544acd20b21dacaa489a5a6226
Aug 02 09:40:23.678 INFO running `"docker" "start" "-a" "53ee7b20f9aa032d2026d9f54d97ab67d539a3544acd20b21dacaa489a5a6226"`
Aug 02 09:40:25.278 INFO kablam!     Checking fs2 v0.4.3 (file:///source)
Aug 02 09:40:25.811 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 09:40:25.811 INFO kablam!  --> src/lib.rs:5:19
Aug 02 09:40:25.811 INFO kablam!   |
Aug 02 09:40:25.811 INFO kablam! 5 | #![cfg_attr(test, feature(test))]
Aug 02 09:40:25.811 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 09:40:25.812 INFO kablam! 
Aug 02 09:40:25.813 INFO kablam! error: aborting due to previous error
Aug 02 09:40:25.813 INFO kablam! 
Aug 02 09:40:25.813 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 09:40:25.820 INFO kablam! error: Could not compile `fs2`.
Aug 02 09:40:25.821 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 09:40:25.863 INFO kablam! error: build failed
Aug 02 09:40:25.864 INFO kablam! su: No module specific data is present
Aug 02 09:40:26.915 INFO running `"docker" "rm" "-f" "53ee7b20f9aa032d2026d9f54d97ab67d539a3544acd20b21dacaa489a5a6226"`
Aug 02 09:40:27.029 INFO blam! 53ee7b20f9aa032d2026d9f54d97ab67d539a3544acd20b21dacaa489a5a6226