Sep 01 14:11:28.648 INFO checking merkle-generator-0.2.0 against master#1114ab684fbad001c4e580326d8eb4d8c4e917d3 for pr-53831
Sep 01 14:11:28.648 INFO running: cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets
Sep 01 14:11:28.648 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-1/pr-53831/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53831/worker-1/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/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" "-e" "USER_ID=500" "-e" "CMD=cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 01 14:11:28.805 INFO blam! 7fccb827569199b7a4c6c8369b3743e7ca0f81df0b03bfb5dc590f7008303516
Sep 01 14:11:28.807 INFO running `"docker" "start" "-a" "7fccb827569199b7a4c6c8369b3743e7ca0f81df0b03bfb5dc590f7008303516"`
Sep 01 14:11:29.575 INFO kablam!     Checking merkle-generator v0.2.0 (file:///source)
Sep 01 14:11:30.345 INFO kablam! warning: unused variable: `roots`
Sep 01 14:11:30.345 INFO kablam!    --> src/lib.rs:142:26
Sep 01 14:11:30.346 INFO kablam!     |
Sep 01 14:11:30.346 INFO kablam! 142 |     fn leaf(leaf: &Node, roots: &Vec<Node>) -> Vec<u8> {
Sep 01 14:11:30.346 INFO kablam!     |                          ^^^^^ help: consider using `_roots` instead
Sep 01 14:11:30.346 INFO kablam!     |
Sep 01 14:11:30.346 INFO kablam!     = note: #[warn(unused_variables)] on by default
Sep 01 14:11:30.346 INFO kablam! 
Sep 01 14:11:30.422 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.89s
Sep 01 14:11:30.426 INFO kablam! su: No module specific data is present
Sep 01 14:11:30.961 INFO running `"docker" "rm" "-f" "7fccb827569199b7a4c6c8369b3743e7ca0f81df0b03bfb5dc590f7008303516"`
Sep 01 14:11:31.053 INFO blam! 7fccb827569199b7a4c6c8369b3743e7ca0f81df0b03bfb5dc590f7008303516