Aug 01 21:06:30.378 INFO checking superslice-0.1.0 against 1.27.2 for lazy_static-1
Aug 01 21:06:30.378 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:06:30.378 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 21:06:30.379 INFO running `"docker" "create" "-v" "/tmp/crater.vSHi3YSokT4q:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-1/1.27.2:/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 01 21:06:30.647 INFO blam! 9314e13e46578adb99e3e0e8a7a3974f27cbd5fea9ba548092710d51f13aa9d9
Aug 01 21:06:30.649 INFO running `"docker" "start" "-a" "9314e13e46578adb99e3e0e8a7a3974f27cbd5fea9ba548092710d51f13aa9d9"`
Aug 01 21:06:31.890 INFO kablam!     Checking superslice v0.1.0 (file:///source)
Aug 01 21:06:33.271 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 21:06:33.271 INFO kablam!   --> benches/bench.rs:15:1
Aug 01 21:06:33.271 INFO kablam!    |
Aug 01 21:06:33.271 INFO kablam! 15 | #![feature(test)]
Aug 01 21:06:33.271 INFO kablam!    | ^^^^^^^^^^^^^^^^^
Aug 01 21:06:33.271 INFO kablam! 
Aug 01 21:06:33.271 INFO kablam! error: aborting due to previous error
Aug 01 21:06:33.271 INFO kablam! 
Aug 01 21:06:33.271 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 21:06:33.279 INFO kablam! error: Could not compile `superslice`.
Aug 01 21:06:33.280 INFO kablam! 
Aug 01 21:06:33.280 INFO kablam! To learn more, run the command again with --verbose.
Aug 01 21:06:33.282 INFO kablam! su: No module specific data is present
Aug 01 21:06:33.895 INFO running `"docker" "rm" "-f" "9314e13e46578adb99e3e0e8a7a3974f27cbd5fea9ba548092710d51f13aa9d9"`
Aug 01 21:06:34.118 INFO blam! 9314e13e46578adb99e3e0e8a7a3974f27cbd5fea9ba548092710d51f13aa9d9