Aug 01 22:40:30.115 INFO checking serde-json-core-0.0.1 against 1.27.2+tmplazy for lazy_static-1
Aug 01 22:40:30.115 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 22:40:30.115 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 01 22:40:30.115 INFO running `"docker" "create" "-v" "/tmp/crater.GyWXRNCHLdU6:/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 01 22:40:30.402 INFO blam! 06390143f4ee29c1600cbfb725a5d8d1e8802cc07767fe34321235d375d43a0d
Aug 01 22:40:30.404 INFO running `"docker" "start" "-a" "06390143f4ee29c1600cbfb725a5d8d1e8802cc07767fe34321235d375d43a0d"`
Aug 01 22:40:31.392 INFO kablam!    Compiling serde v1.0.70
Aug 01 22:40:31.394 INFO kablam!     Checking untagged-option v0.1.1
Aug 01 22:40:31.583 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 01 22:40:31.583 INFO kablam!  --> /cargo-home/registry/src/github.com-1ecc6299db9ec823/untagged-option-0.1.1/src/lib.rs:5:1
Aug 01 22:40:31.583 INFO kablam!   |
Aug 01 22:40:31.583 INFO kablam! 5 | #![feature(untagged_unions, const_fn)]
Aug 01 22:40:31.584 INFO kablam!   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Aug 01 22:40:31.584 INFO kablam! 
Aug 01 22:40:31.584 INFO kablam! error: aborting due to previous error
Aug 01 22:40:31.584 INFO kablam! 
Aug 01 22:40:31.584 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 01 22:40:31.589 INFO kablam! error: Could not compile `untagged-option`.
Aug 01 22:40:31.589 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 01 22:40:32.974 INFO kablam! error: build failed
Aug 01 22:40:32.975 INFO kablam! su: No module specific data is present
Aug 01 22:40:33.650 INFO running `"docker" "rm" "-f" "06390143f4ee29c1600cbfb725a5d8d1e8802cc07767fe34321235d375d43a0d"`
Aug 01 22:40:33.807 INFO blam! 06390143f4ee29c1600cbfb725a5d8d1e8802cc07767fe34321235d375d43a0d