Sep 06 03:52:34.934 INFO checking merkle-generator-0.2.0 against try#51ff957df5095d92d1d3d4682207ee8b7ad408a8 for pr-53854
Sep 06 03:52:34.934 INFO running: cargo +51ff957df5095d92d1d3d4682207ee8b7ad408a8-alt check --frozen --all --all-targets
Sep 06 03:52:34.934 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-4/pr-53854/try#51ff957df5095d92d1d3d4682207ee8b7ad408a8:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53854/worker-4/try#51ff957df5095d92d1d3d4682207ee8b7ad408a8:/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=1000" "-e" "CMD=cargo +51ff957df5095d92d1d3d4682207ee8b7ad408a8-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 06 03:52:35.099 INFO blam! 568920a39e273313d732122612ca326dd4e4808646478082138c072bb53e902c
Sep 06 03:52:35.101 INFO running `"docker" "start" "-a" "568920a39e273313d732122612ca326dd4e4808646478082138c072bb53e902c"`
Sep 06 03:52:35.768 INFO kablam! usermod: no changes
Sep 06 03:52:35.852 INFO kablam!     Checking flat-tree v1.1.0
Sep 06 03:52:36.227 INFO kablam!     Checking merkle-generator v0.2.0 (file:///source)
Sep 06 03:52:36.806 INFO kablam! warning: unused variable: `roots`
Sep 06 03:52:36.806 INFO kablam!    --> src/lib.rs:142:26
Sep 06 03:52:36.806 INFO kablam!     |
Sep 06 03:52:36.806 INFO kablam! 142 |     fn leaf(leaf: &Node, roots: &Vec<Node>) -> Vec<u8> {
Sep 06 03:52:36.806 INFO kablam!     |                          ^^^^^ help: consider using `_roots` instead
Sep 06 03:52:36.806 INFO kablam!     |
Sep 06 03:52:36.806 INFO kablam!     = note: #[warn(unused_variables)] on by default
Sep 06 03:52:36.806 INFO kablam! 
Sep 06 03:52:36.872 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 1.07s
Sep 06 03:52:36.886 INFO kablam! su: No module specific data is present
Sep 06 03:52:37.559 INFO running `"docker" "rm" "-f" "568920a39e273313d732122612ca326dd4e4808646478082138c072bb53e902c"`
Sep 06 03:52:37.675 INFO blam! 568920a39e273313d732122612ca326dd4e4808646478082138c072bb53e902c