Aug 01 22:02:39.430 INFO checking sleepfast-1.3.0 against 1.27.2+tmplazy for lazy_static-1
Aug 01 22:02:39.430 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 22:02:39.430 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 22:02:39.430 INFO running `"docker" "create" "-v" "/tmp/crater.LE67RFOMQJnq:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2+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 01 22:02:39.748 INFO blam! 439b8770c7e66f09fff8771082f06ec6a79814bce901062a3b8f8daa9e28a83a
Aug 01 22:02:39.749 INFO running `"docker" "start" "-a" "439b8770c7e66f09fff8771082f06ec6a79814bce901062a3b8f8daa9e28a83a"`
Aug 01 22:02:41.168 INFO kablam!     Checking sleepfast v1.3.0 (file:///source)
Aug 01 22:02:42.617 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 22:02:42.617 INFO kablam!   --> tests/sleepfast-tests.rs:18:1
Aug 01 22:02:42.617 INFO kablam!    |
Aug 01 22:02:42.617 INFO kablam! 18 | #![feature(test)]
Aug 01 22:02:42.617 INFO kablam!    | ^^^^^^^^^^^^^^^^^
Aug 01 22:02:42.617 INFO kablam! 
Aug 01 22:02:42.617 INFO kablam! error: aborting due to previous error
Aug 01 22:02:42.617 INFO kablam! 
Aug 01 22:02:42.617 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 22:02:42.626 INFO kablam! error: Could not compile `sleepfast`.
Aug 01 22:02:42.626 INFO kablam! 
Aug 01 22:02:42.626 INFO kablam! To learn more, run the command again with --verbose.
Aug 01 22:02:42.627 INFO kablam! su: No module specific data is present
Aug 01 22:02:43.798 INFO running `"docker" "rm" "-f" "439b8770c7e66f09fff8771082f06ec6a79814bce901062a3b8f8daa9e28a83a"`
Aug 01 22:02:43.951 INFO blam! 439b8770c7e66f09fff8771082f06ec6a79814bce901062a3b8f8daa9e28a83a