Aug 01 23:11:50.773 INFO checking rwcell-0.1.2 against 1.27.2+tmplazy for lazy_static-1
Aug 01 23:11:50.773 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:11:50.773 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 23:11:50.773 INFO running `"docker" "create" "-v" "/tmp/crater.JtrO84d0prwR:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-5/1.27.2+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 01 23:11:51.019 INFO blam! 64c851eb4cfc0832ef22ae53ef8831777b9632b1376f5982bb576a20370ed8fa
Aug 01 23:11:51.021 INFO running `"docker" "start" "-a" "64c851eb4cfc0832ef22ae53ef8831777b9632b1376f5982bb576a20370ed8fa"`
Aug 01 23:11:51.917 INFO kablam!     Checking rwcell v0.1.2 (file:///source)
Aug 01 23:11:52.653 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 23:11:52.653 INFO kablam!  --> src/lib.rs:2:1
Aug 01 23:11:52.653 INFO kablam!   |
Aug 01 23:11:52.653 INFO kablam! 2 | #![feature(time2)]
Aug 01 23:11:52.653 INFO kablam!   | ^^^^^^^^^^^^^^^^^^
Aug 01 23:11:52.653 INFO kablam! 
Aug 01 23:11:52.654 INFO kablam! error: aborting due to previous error
Aug 01 23:11:52.654 INFO kablam! 
Aug 01 23:11:52.654 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 23:11:52.662 INFO kablam! error: Could not compile `rwcell`.
Aug 01 23:11:52.662 INFO kablam! 
Aug 01 23:11:52.662 INFO kablam! To learn more, run the command again with --verbose.
Aug 01 23:11:52.664 INFO kablam! su: No module specific data is present
Aug 01 23:11:53.237 INFO running `"docker" "rm" "-f" "64c851eb4cfc0832ef22ae53ef8831777b9632b1376f5982bb576a20370ed8fa"`
Aug 01 23:11:53.464 INFO blam! 64c851eb4cfc0832ef22ae53ef8831777b9632b1376f5982bb576a20370ed8fa