Aug 02 07:27:30.265 INFO checking hamt-rs-0.3.0 against 1.27.2+tmplazy for lazy_static-1
Aug 02 07:27:30.265 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 07:27:30.265 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 07:27:30.265 INFO running `"docker" "create" "-v" "/tmp/crater.R1i5nzxwoaQF:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-7/1.27.2+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 02 07:27:30.526 INFO blam! 290fff216042d538c27c7706404f1bd5684180925e1fdc3feccd439c3ef353e1
Aug 02 07:27:30.529 INFO running `"docker" "start" "-a" "290fff216042d538c27c7706404f1bd5684180925e1fdc3feccd439c3ef353e1"`
Aug 02 07:27:31.807 INFO kablam!     Checking hamt-rs v0.3.0 (file:///source)
Aug 02 07:27:35.793 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 07:27:35.793 INFO kablam!   --> benches/benches.rs:21:1
Aug 02 07:27:35.793 INFO kablam!    |
Aug 02 07:27:35.793 INFO kablam! 21 | #![feature(test)]
Aug 02 07:27:35.793 INFO kablam!    | ^^^^^^^^^^^^^^^^^
Aug 02 07:27:35.794 INFO kablam! 
Aug 02 07:27:35.794 INFO kablam! error: aborting due to previous error
Aug 02 07:27:35.794 INFO kablam! 
Aug 02 07:27:35.794 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 07:27:35.803 INFO kablam! error: Could not compile `hamt-rs`.
Aug 02 07:27:35.804 INFO kablam! 
Aug 02 07:27:35.804 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 07:27:35.806 INFO kablam! su: No module specific data is present
Aug 02 07:27:36.371 INFO running `"docker" "rm" "-f" "290fff216042d538c27c7706404f1bd5684180925e1fdc3feccd439c3ef353e1"`
Aug 02 07:27:36.524 INFO blam! 290fff216042d538c27c7706404f1bd5684180925e1fdc3feccd439c3ef353e1