Aug 02 09:37:51.592 INFO checking futf-0.1.4 against 1.27.2 for lazy_static-1
Aug 02 09:37:51.592 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 09:37:51.592 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 09:37:51.592 INFO running `"docker" "create" "-v" "/tmp/crater.sY0HCr1rE6sr:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2:/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 09:37:51.807 INFO blam! 39e4824329df665707120e7c6303c6ecd7e03541ae44a7995eb70b6eb7788ba6
Aug 02 09:37:51.810 INFO running `"docker" "start" "-a" "39e4824329df665707120e7c6303c6ecd7e03541ae44a7995eb70b6eb7788ba6"`
Aug 02 09:37:53.209 INFO kablam!     Checking futf v0.1.4 (file:///source)
Aug 02 09:37:53.862 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 09:37:53.862 INFO kablam!  --> src/lib.rs:7:19
Aug 02 09:37:53.862 INFO kablam!   |
Aug 02 09:37:53.862 INFO kablam! 7 | #![cfg_attr(test, feature(test, str_char))]
Aug 02 09:37:53.862 INFO kablam!   |                   ^^^^^^^^^^^^^^^^^^^^^^^^
Aug 02 09:37:53.862 INFO kablam! 
Aug 02 09:37:53.866 INFO kablam! error: aborting due to previous error
Aug 02 09:37:53.866 INFO kablam! 
Aug 02 09:37:53.867 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 09:37:53.884 INFO kablam! error: Could not compile `futf`.
Aug 02 09:37:53.885 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 09:37:54.243 INFO kablam! error: build failed
Aug 02 09:37:54.254 INFO kablam! su: No module specific data is present
Aug 02 09:37:55.030 INFO running `"docker" "rm" "-f" "39e4824329df665707120e7c6303c6ecd7e03541ae44a7995eb70b6eb7788ba6"`
Aug 02 09:37:55.221 INFO blam! 39e4824329df665707120e7c6303c6ecd7e03541ae44a7995eb70b6eb7788ba6