Aug 02 14:05:17.585 INFO checking bit_reverse-0.1.7 against 1.27.2 for lazy_static-1
Aug 02 14:05:17.585 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 14:05:17.585 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 14:05:17.585 INFO running `"docker" "create" "-v" "/tmp/crater.dYhAdIIDhRkE:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2:/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 14:05:17.810 INFO blam! aa7f74f5b6154c5dadd3ae782e2111d8ca6676c0ce1bf55be06fad450f83214d
Aug 02 14:05:17.812 INFO running `"docker" "start" "-a" "aa7f74f5b6154c5dadd3ae782e2111d8ca6676c0ce1bf55be06fad450f83214d"`
Aug 02 14:05:19.070 INFO kablam!     Checking bit_reverse v0.1.7 (file:///source)
Aug 02 14:05:20.398 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 14:05:20.398 INFO kablam!  --> benches/primitives.rs:2:1
Aug 02 14:05:20.398 INFO kablam!   |
Aug 02 14:05:20.398 INFO kablam! 2 | #![feature(test)]
Aug 02 14:05:20.398 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 14:05:20.398 INFO kablam! 
Aug 02 14:05:20.399 INFO kablam! error: aborting due to previous error
Aug 02 14:05:20.399 INFO kablam! 
Aug 02 14:05:20.399 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 14:05:20.405 INFO kablam! error: Could not compile `bit_reverse`.
Aug 02 14:05:20.405 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 14:05:20.478 INFO kablam! error: build failed
Aug 02 14:05:20.480 INFO kablam! su: No module specific data is present
Aug 02 14:05:21.571 INFO running `"docker" "rm" "-f" "aa7f74f5b6154c5dadd3ae782e2111d8ca6676c0ce1bf55be06fad450f83214d"`
Aug 02 14:05:21.663 INFO blam! aa7f74f5b6154c5dadd3ae782e2111d8ca6676c0ce1bf55be06fad450f83214d