Aug 02 05:14:28.932 INFO checking lifeguard-0.5.2 against 1.27.2+tmplazy for lazy_static-1
Aug 02 05:14:28.932 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:14:28.932 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 05:14:28.932 INFO running `"docker" "create" "-v" "/tmp/crater.IHZb12QzZKLO:/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 05:14:29.215 INFO blam! 73866862b952f4f0333488519b4e6f2a41f75cbcf2ed5f5550528224c7e9d914
Aug 02 05:14:29.218 INFO running `"docker" "start" "-a" "73866862b952f4f0333488519b4e6f2a41f75cbcf2ed5f5550528224c7e9d914"`
Aug 02 05:14:30.358 INFO kablam!     Checking lifeguard v0.5.2 (file:///source)
Aug 02 05:14:32.327 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 05:14:32.327 INFO kablam!  --> benches/lib.rs:1:1
Aug 02 05:14:32.327 INFO kablam!   |
Aug 02 05:14:32.327 INFO kablam! 1 | #![feature(test)]
Aug 02 05:14:32.327 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 05:14:32.327 INFO kablam! 
Aug 02 05:14:32.329 INFO kablam! error: aborting due to previous error
Aug 02 05:14:32.329 INFO kablam! 
Aug 02 05:14:32.329 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 05:14:32.343 INFO kablam! error: Could not compile `lifeguard`.
Aug 02 05:14:32.343 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 05:14:33.036 INFO kablam! error: build failed
Aug 02 05:14:33.037 INFO kablam! su: No module specific data is present
Aug 02 05:14:33.836 INFO running `"docker" "rm" "-f" "73866862b952f4f0333488519b4e6f2a41f75cbcf2ed5f5550528224c7e9d914"`
Aug 02 05:14:34.029 INFO blam! 73866862b952f4f0333488519b4e6f2a41f75cbcf2ed5f5550528224c7e9d914