Aug 01 19:33:42.792 INFO checking unsafe_unwrap-0.1.0 against 1.27.2+tmplazy for lazy_static-1
Aug 01 19:33:42.792 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 19:33:42.792 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 19:33:42.792 INFO running `"docker" "create" "-v" "/tmp/crater.mciqKYl2cQV2:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-5/1.27.2+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 19:33:43.006 INFO blam! 7dfe53564407a39cdf3611d3750596f9060f0141f249cad9d95828cf1c254856
Aug 01 19:33:43.006 INFO running `"docker" "start" "-a" "7dfe53564407a39cdf3611d3750596f9060f0141f249cad9d95828cf1c254856"`
Aug 01 19:33:44.078 INFO kablam!     Checking unsafe_unwrap v0.1.0 (file:///source)
Aug 01 19:33:44.623 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 19:33:44.623 INFO kablam!   --> src/lib.rs:23:19
Aug 01 19:33:44.623 INFO kablam!    |
Aug 01 19:33:44.623 INFO kablam! 23 | #![cfg_attr(test, feature(test))]
Aug 01 19:33:44.623 INFO kablam!    |                   ^^^^^^^^^^^^^^
Aug 01 19:33:44.637 INFO kablam! 
Aug 01 19:33:44.637 INFO kablam! error: aborting due to previous error
Aug 01 19:33:44.637 INFO kablam! 
Aug 01 19:33:44.638 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 19:33:44.649 INFO kablam! error: Could not compile `unsafe_unwrap`.
Aug 01 19:33:44.649 INFO kablam! 
Aug 01 19:33:44.649 INFO kablam! To learn more, run the command again with --verbose.
Aug 01 19:33:44.651 INFO kablam! su: No module specific data is present
Aug 01 19:33:45.147 INFO running `"docker" "rm" "-f" "7dfe53564407a39cdf3611d3750596f9060f0141f249cad9d95828cf1c254856"`
Aug 01 19:33:45.327 INFO blam! 7dfe53564407a39cdf3611d3750596f9060f0141f249cad9d95828cf1c254856