Aug 01 21:06:28.721 INFO checking superslice-0.1.0 against 1.27.2+tmplazy for lazy_static-1
Aug 01 21:06:28.721 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:06:28.721 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:06:28.721 INFO running `"docker" "create" "-v" "/tmp/crater.DVEdDspm65nK:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-3/1.27.2+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 21:06:28.954 INFO blam! 2169723cfecafb30c1cd248888490302cf9ee416d6f79241da50f51c19d4151d
Aug 01 21:06:28.957 INFO running `"docker" "start" "-a" "2169723cfecafb30c1cd248888490302cf9ee416d6f79241da50f51c19d4151d"`
Aug 01 21:06:30.005 INFO kablam!     Checking superslice v0.1.0 (file:///source)
Aug 01 21:06:31.252 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 21:06:31.252 INFO kablam!   --> benches/bench.rs:15:1
Aug 01 21:06:31.252 INFO kablam!    |
Aug 01 21:06:31.252 INFO kablam! 15 | #![feature(test)]
Aug 01 21:06:31.252 INFO kablam!    | ^^^^^^^^^^^^^^^^^
Aug 01 21:06:31.252 INFO kablam! 
Aug 01 21:06:31.252 INFO kablam! error: aborting due to previous error
Aug 01 21:06:31.252 INFO kablam! 
Aug 01 21:06:31.252 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 21:06:31.261 INFO kablam! error: Could not compile `superslice`.
Aug 01 21:06:31.262 INFO kablam! 
Aug 01 21:06:31.262 INFO kablam! To learn more, run the command again with --verbose.
Aug 01 21:06:31.263 INFO kablam! su: No module specific data is present
Aug 01 21:06:32.082 INFO running `"docker" "rm" "-f" "2169723cfecafb30c1cd248888490302cf9ee416d6f79241da50f51c19d4151d"`
Aug 01 21:06:32.255 INFO blam! 2169723cfecafb30c1cd248888490302cf9ee416d6f79241da50f51c19d4151d