Aug 02 01:58:41.234 INFO checking pretty-0.3.3 against 1.27.2+tmplazy for lazy_static-1
Aug 02 01:58:41.234 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:58:41.234 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:58:41.234 INFO running `"docker" "create" "-v" "/tmp/crater.sSNSFKeWRrV1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-2/1.27.2+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 01:58:41.420 INFO blam! bd93fd51f2d91d9ee08828c366e4d8c184ef447286165ac579086863c20d264e
Aug 02 01:58:41.421 INFO running `"docker" "start" "-a" "bd93fd51f2d91d9ee08828c366e4d8c184ef447286165ac579086863c20d264e"`
Aug 02 01:58:43.091 INFO kablam!     Checking pretty v0.3.3 (file:///source)
Aug 02 01:58:44.774 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 01:58:44.774 INFO kablam!  --> benches/trees.rs:1:1
Aug 02 01:58:44.774 INFO kablam!   |
Aug 02 01:58:44.775 INFO kablam! 1 | #![feature(test)]
Aug 02 01:58:44.775 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 01:58:44.775 INFO kablam! 
Aug 02 01:58:44.776 INFO kablam! error: aborting due to previous error
Aug 02 01:58:44.777 INFO kablam! 
Aug 02 01:58:44.777 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 01:58:44.803 INFO kablam! error: Could not compile `pretty`.
Aug 02 01:58:44.804 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 01:58:44.863 INFO kablam! error: build failed
Aug 02 01:58:44.866 INFO kablam! su: No module specific data is present
Aug 02 01:58:45.562 INFO running `"docker" "rm" "-f" "bd93fd51f2d91d9ee08828c366e4d8c184ef447286165ac579086863c20d264e"`
Aug 02 01:58:45.744 INFO blam! bd93fd51f2d91d9ee08828c366e4d8c184ef447286165ac579086863c20d264e