Aug 02 09:44:23.399 INFO checking from_error_scope-0.0.1 against 1.27.2 for lazy_static-1
Aug 02 09:44:23.399 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 09:44:23.399 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 09:44:23.400 INFO running `"docker" "create" "-v" "/tmp/crater.IxfuL6LCeaLm:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2:/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 09:44:23.590 INFO blam! 48d5f1ce449d6ac264a0d3846fd794986ca321d1099dad1faa09755a257fddfd
Aug 02 09:44:23.592 INFO running `"docker" "start" "-a" "48d5f1ce449d6ac264a0d3846fd794986ca321d1099dad1faa09755a257fddfd"`
Aug 02 09:44:25.140 INFO kablam!     Checking from_error_scope v0.0.1 (file:///source)
Aug 02 09:44:25.824 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 09:44:25.824 INFO kablam!   --> examples/simple.rs:15:1
Aug 02 09:44:25.824 INFO kablam!    |
Aug 02 09:44:25.824 INFO kablam! 15 | #![feature(core, io)]
Aug 02 09:44:25.824 INFO kablam!    | ^^^^^^^^^^^^^^^^^^^^^
Aug 02 09:44:25.824 INFO kablam! 
Aug 02 09:44:25.824 INFO kablam! error: aborting due to previous error
Aug 02 09:44:25.824 INFO kablam! 
Aug 02 09:44:25.824 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 09:44:25.824 INFO kablam! error: Could not compile `from_error_scope`.
Aug 02 09:44:25.824 INFO kablam! 
Aug 02 09:44:25.824 INFO kablam! To learn more, run the command again with --verbose.
Aug 02 09:44:25.826 INFO kablam! su: No module specific data is present
Aug 02 09:44:26.914 INFO running `"docker" "rm" "-f" "48d5f1ce449d6ac264a0d3846fd794986ca321d1099dad1faa09755a257fddfd"`
Aug 02 09:44:27.031 INFO blam! 48d5f1ce449d6ac264a0d3846fd794986ca321d1099dad1faa09755a257fddfd