Aug 02 06:15:33.283 INFO checking json-tools-1.0.1 against 1.27.2 for lazy_static-1
Aug 02 06:15:33.283 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 06:15:33.283 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 06:15:33.284 INFO running `"docker" "create" "-v" "/tmp/crater.ONlZZh7DXVnP:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/lazy_static-1/worker-3/1.27.2:/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 06:15:33.524 INFO blam! 337e14d4c4a609a1e2105d5a00382aca385908d4a77fbc47324b79e05d03645c
Aug 02 06:15:33.526 INFO running `"docker" "start" "-a" "337e14d4c4a609a1e2105d5a00382aca385908d4a77fbc47324b79e05d03645c"`
Aug 02 06:15:34.690 INFO kablam!     Checking json-tools v1.0.1 (file:///source)
Aug 02 06:15:37.143 INFO kablam! error[E0554]: #![feature] may not be used on the stable release channel
Aug 02 06:15:37.144 INFO kablam!  --> benches/usage.rs:1:1
Aug 02 06:15:37.144 INFO kablam!   |
Aug 02 06:15:37.144 INFO kablam! 1 | #![feature(test)]
Aug 02 06:15:37.144 INFO kablam!   | ^^^^^^^^^^^^^^^^^
Aug 02 06:15:37.144 INFO kablam! 
Aug 02 06:15:37.144 INFO kablam! error: aborting due to previous error
Aug 02 06:15:37.144 INFO kablam! 
Aug 02 06:15:37.145 INFO kablam! For more information about this error, try `rustc --explain E0554`.
Aug 02 06:15:37.152 INFO kablam! error: Could not compile `json-tools`.
Aug 02 06:15:37.153 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 02 06:15:37.204 INFO kablam! error: build failed
Aug 02 06:15:37.206 INFO kablam! su: No module specific data is present
Aug 02 06:15:37.881 INFO running `"docker" "rm" "-f" "337e14d4c4a609a1e2105d5a00382aca385908d4a77fbc47324b79e05d03645c"`
Aug 02 06:15:38.058 INFO blam! 337e14d4c4a609a1e2105d5a00382aca385908d4a77fbc47324b79e05d03645c