Aug 02 02:06:57.967 INFO checking polymap-0.3.0 against 1.27.2 for lazy_static-1
Aug 02 02:06:57.967 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 02:06:57.967 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 02:06:57.968 INFO running `"docker" "create" "-v" "/tmp/crater.gp7nAfZ48bgy:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-7/1.27.2:/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 02:06:58.241 INFO blam! f10aabf0586fa36480e168f6923b734b8ba7d37e9a17a644b46c2236396d30a3
Aug 02 02:06:58.243 INFO running `"docker" "start" "-a" "f10aabf0586fa36480e168f6923b734b8ba7d37e9a17a644b46c2236396d30a3"`
Aug 02 02:06:59.270 INFO kablam!     Checking polymap v0.3.0 (file:///source)
Aug 02 02:07:01.098 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 02:07:01.098 INFO kablam!  --> benches/polymap.rs:1:1
Aug 02 02:07:01.098 INFO kablam!   |
Aug 02 02:07:01.098 INFO kablam! 1 | #![feature(test)]
Aug 02 02:07:01.098 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 02:07:01.098 INFO kablam! 
Aug 02 02:07:01.098 INFO kablam! error: aborting due to previous error
Aug 02 02:07:01.098 INFO kablam! 
Aug 02 02:07:01.098 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 02:07:01.107 INFO kablam! error: Could not compile `polymap`.
Aug 02 02:07:01.108 INFO kablam! 
Aug 02 02:07:01.108 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 02:07:01.108 INFO kablam! su: No module specific data is present
Aug 02 02:07:01.769 INFO running `"docker" "rm" "-f" "f10aabf0586fa36480e168f6923b734b8ba7d37e9a17a644b46c2236396d30a3"`
Aug 02 02:07:01.883 INFO blam! f10aabf0586fa36480e168f6923b734b8ba7d37e9a17a644b46c2236396d30a3