Aug 02 06:15:33.177 INFO checking json-tools-1.0.1 against 1.27.2+tmplazy for lazy_static-1
Aug 02 06:15:33.177 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 06:15:33.177 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 06:15:33.177 INFO running `"docker" "create" "-v" "/tmp/crater.jNmR1DAkJK0G:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-6/1.27.2+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 06:15:33.405 INFO blam! 6c702837b38c0aecb467868d7011cae09ea484bee7e868c27d430ba84bca283d
Aug 02 06:15:33.415 INFO running `"docker" "start" "-a" "6c702837b38c0aecb467868d7011cae09ea484bee7e868c27d430ba84bca283d"`
Aug 02 06:15:34.190 INFO kablam!     Checking json-tools v1.0.1 (file:///source)
Aug 02 06:15:36.189 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 06:15:36.189 INFO kablam!  --> benches/usage.rs:1:1
Aug 02 06:15:36.189 INFO kablam!   |
Aug 02 06:15:36.189 INFO kablam! 1 | #![feature(test)]
Aug 02 06:15:36.189 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 06:15:36.189 INFO kablam! 
Aug 02 06:15:36.190 INFO kablam! error: aborting due to previous error
Aug 02 06:15:36.190 INFO kablam! 
Aug 02 06:15:36.190 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 06:15:36.216 INFO kablam! error: Could not compile `json-tools`.
Aug 02 06:15:36.217 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 06:15:36.764 INFO kablam! error: build failed
Aug 02 06:15:36.770 INFO kablam! su: No module specific data is present
Aug 02 06:15:37.502 INFO running `"docker" "rm" "-f" "6c702837b38c0aecb467868d7011cae09ea484bee7e868c27d430ba84bca283d"`
Aug 02 06:15:37.696 INFO blam! 6c702837b38c0aecb467868d7011cae09ea484bee7e868c27d430ba84bca283d