Aug 02 01:58:41.577 INFO checking pretty-0.5.2 against 1.27.2+tmplazy for lazy_static-1
Aug 02 01:58:41.578 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:58:41.578 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:58:41.578 INFO running `"docker" "create" "-v" "/tmp/crater.IyTuLCf2SXWa:/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 01:58:41.880 INFO blam! 0560b14b8113ac1e34c35f1ed444ac443748844537903138dfcd743b2881b9e9
Aug 02 01:58:41.881 INFO running `"docker" "start" "-a" "0560b14b8113ac1e34c35f1ed444ac443748844537903138dfcd743b2881b9e9"`
Aug 02 01:58:43.357 INFO kablam!     Checking pretty v0.5.2 (file:///source)
Aug 02 01:58:45.255 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 01:58:45.255 INFO kablam!  --> benches/trees.rs:1:1
Aug 02 01:58:45.255 INFO kablam!   |
Aug 02 01:58:45.255 INFO kablam! 1 | #![feature(test)]
Aug 02 01:58:45.255 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 01:58:45.255 INFO kablam! 
Aug 02 01:58:45.255 INFO kablam! error: aborting due to previous error
Aug 02 01:58:45.255 INFO kablam! 
Aug 02 01:58:45.255 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 01:58:45.263 INFO kablam! error: Could not compile `pretty`.
Aug 02 01:58:45.264 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 01:58:45.405 INFO kablam! error: build failed
Aug 02 01:58:45.407 INFO kablam! su: No module specific data is present
Aug 02 01:58:46.056 INFO running `"docker" "rm" "-f" "0560b14b8113ac1e34c35f1ed444ac443748844537903138dfcd743b2881b9e9"`
Aug 02 01:58:46.212 INFO blam! 0560b14b8113ac1e34c35f1ed444ac443748844537903138dfcd743b2881b9e9