Aug 02 07:16:09.086 INFO checking histo-0.1.0 against 1.27.2 for lazy_static-1
Aug 02 07:16:09.086 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 07:16:09.086 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 07:16:09.086 INFO running `"docker" "create" "-v" "/tmp/crater.k7STMAlcP2An:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-4/1.27.2:/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 07:16:09.271 INFO blam! efdf6cc20b0722d64a155cf1822f0c2213c314223b2a9b926314885e3985c514
Aug 02 07:16:09.274 INFO running `"docker" "start" "-a" "efdf6cc20b0722d64a155cf1822f0c2213c314223b2a9b926314885e3985c514"`
Aug 02 07:16:10.519 INFO kablam!     Checking streaming-stats v0.1.29
Aug 02 07:16:11.326 INFO kablam!     Checking histo v0.1.0 (file:///source)
Aug 02 07:16:13.254 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 07:16:13.254 INFO kablam!  --> benches/bench.rs:1:1
Aug 02 07:16:13.254 INFO kablam!   |
Aug 02 07:16:13.254 INFO kablam! 1 | #![feature(test)]
Aug 02 07:16:13.254 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 07:16:13.256 INFO kablam! 
Aug 02 07:16:13.256 INFO kablam! error: aborting due to previous error
Aug 02 07:16:13.256 INFO kablam! 
Aug 02 07:16:13.256 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 07:16:13.264 INFO kablam! error: Could not compile `histo`.
Aug 02 07:16:13.264 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 07:16:13.356 INFO kablam! error: build failed
Aug 02 07:16:13.357 INFO kablam! su: No module specific data is present
Aug 02 07:16:14.008 INFO running `"docker" "rm" "-f" "efdf6cc20b0722d64a155cf1822f0c2213c314223b2a9b926314885e3985c514"`
Aug 02 07:16:14.238 INFO blam! efdf6cc20b0722d64a155cf1822f0c2213c314223b2a9b926314885e3985c514