Aug 02 01:58:46.244 INFO checking pretty-0.3.3 against 1.27.2 for lazy_static-1
Aug 02 01:58:46.244 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:58:46.244 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 01:58:46.244 INFO running `"docker" "create" "-v" "/tmp/crater.K0X6jzfK5oZa:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-7/1.27.2:/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 01:58:46.515 INFO blam! 79d121fe80907dff52978a433ae6a2e84e1b3864b747d3f76175c7291d28a37e
Aug 02 01:58:46.517 INFO running `"docker" "start" "-a" "79d121fe80907dff52978a433ae6a2e84e1b3864b747d3f76175c7291d28a37e"`
Aug 02 01:58:47.752 INFO kablam!     Checking pretty v0.3.3 (file:///source)
Aug 02 01:58:49.670 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 01:58:49.670 INFO kablam!  --> benches/trees.rs:1:1
Aug 02 01:58:49.670 INFO kablam!   |
Aug 02 01:58:49.670 INFO kablam! 1 | #![feature(test)]
Aug 02 01:58:49.670 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 01:58:49.670 INFO kablam! 
Aug 02 01:58:49.670 INFO kablam! error: aborting due to previous error
Aug 02 01:58:49.671 INFO kablam! 
Aug 02 01:58:49.671 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 01:58:49.680 INFO kablam! error: Could not compile `pretty`.
Aug 02 01:58:49.680 INFO kablam! 
Aug 02 01:58:49.680 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 01:58:49.682 INFO kablam! su: No module specific data is present
Aug 02 01:58:50.515 INFO running `"docker" "rm" "-f" "79d121fe80907dff52978a433ae6a2e84e1b3864b747d3f76175c7291d28a37e"`
Aug 02 01:58:50.617 INFO blam! 79d121fe80907dff52978a433ae6a2e84e1b3864b747d3f76175c7291d28a37e