Aug 02 04:28:19.910 INFO checking merkle-generator-0.2.0 against 1.27.2 for lazy_static-1
Aug 02 04:28:19.910 INFO running: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:28:19.910 INFO creating container for: cargo +1.27.2 check --frozen --all --all-targets
Aug 02 04:28:19.910 INFO running `"docker" "create" "-v" "/tmp/crater.o1Ju7yd2veq3:/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 04:28:20.106 INFO blam! 8df24ec5be0bd2891ef8d76e4823bc5c06c5b0f33956529b1294fd204c1b5e69
Aug 02 04:28:20.109 INFO running `"docker" "start" "-a" "8df24ec5be0bd2891ef8d76e4823bc5c06c5b0f33956529b1294fd204c1b5e69"`
Aug 02 04:28:20.962 INFO kablam!     Checking flat-tree v1.1.0
Aug 02 04:28:21.652 INFO kablam!     Checking merkle-generator v0.2.0 (file:///source)
Aug 02 04:28:22.776 INFO kablam! warning: unused variable: `roots`
Aug 02 04:28:22.776 INFO kablam!    --> src/lib.rs:142:26
Aug 02 04:28:22.776 INFO kablam!     |
Aug 02 04:28:22.776 INFO kablam! 142 |     fn leaf(leaf: &Node, roots: &Vec<Node>) -> Vec<u8> {
Aug 02 04:28:22.776 INFO kablam!     |                          ^^^^^ help: consider using `_roots` instead
Aug 02 04:28:22.777 INFO kablam!     |
Aug 02 04:28:22.777 INFO kablam!     = note: #[warn(unused_variables)] on by default
Aug 02 04:28:22.777 INFO kablam! 
Aug 02 04:28:22.885 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 1.99s
Aug 02 04:28:22.890 INFO kablam! su: No module specific data is present
Aug 02 04:28:23.587 INFO running `"docker" "rm" "-f" "8df24ec5be0bd2891ef8d76e4823bc5c06c5b0f33956529b1294fd204c1b5e69"`
Aug 02 04:28:23.697 INFO blam! 8df24ec5be0bd2891ef8d76e4823bc5c06c5b0f33956529b1294fd204c1b5e69