Aug 02 00:05:33.620 INFO checking rtrace-1.0.0 against 1.27.2+tmplazy for lazy_static-1
Aug 02 00:05:33.620 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 00:05:33.620 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 00:05:33.621 INFO running `"docker" "create" "-v" "/tmp/crater.0exdIM09r5gf:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-0/1.27.2+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 00:05:33.854 INFO blam! 584b2d906777582b57aee86e2a12e41016d125850b556d4fbf4aff3f3a8c805c
Aug 02 00:05:33.858 INFO running `"docker" "start" "-a" "584b2d906777582b57aee86e2a12e41016d125850b556d4fbf4aff3f3a8c805c"`
Aug 02 00:05:34.780 INFO kablam!     Checking rtrace v1.0.0 (file:///source)
Aug 02 00:05:35.281 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 00:05:35.281 INFO kablam!  --> src/rust/lib.rs:1:19
Aug 02 00:05:35.281 INFO kablam!   |
Aug 02 00:05:35.281 INFO kablam! 1 | #![cfg_attr(test, feature(test))]
Aug 02 00:05:35.281 INFO kablam!   |                   ^^^^^^^^^^^^^^
Aug 02 00:05:35.281 INFO kablam! 
Aug 02 00:05:35.282 INFO kablam! error: aborting due to previous error
Aug 02 00:05:35.283 INFO kablam! 
Aug 02 00:05:35.283 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 00:05:35.292 INFO kablam! error: Could not compile `rtrace`.
Aug 02 00:05:35.293 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 00:05:35.625 INFO kablam! error: build failed
Aug 02 00:05:35.627 INFO kablam! su: No module specific data is present
Aug 02 00:05:36.247 INFO running `"docker" "rm" "-f" "584b2d906777582b57aee86e2a12e41016d125850b556d4fbf4aff3f3a8c805c"`
Aug 02 00:05:36.351 INFO blam! 584b2d906777582b57aee86e2a12e41016d125850b556d4fbf4aff3f3a8c805c