Sep 04 11:04:30.099 INFO checking merkle-generator-0.2.0 against master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c for pr-53893
Sep 04 11:04:30.099 INFO running: cargo +28bcffead74d5e17c6cb1f7de432e37f93a6b50c-alt check --frozen --all --all-targets
Sep 04 11:04:30.099 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-53893/master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53893/worker-2/master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c:/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 +28bcffead74d5e17c6cb1f7de432e37f93a6b50c-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 04 11:04:30.338 INFO blam! 7247a0e9841540442bbc68b937c87b66c9aee56591c7fa466eb13444551298b7
Sep 04 11:04:30.340 INFO running `"docker" "start" "-a" "7247a0e9841540442bbc68b937c87b66c9aee56591c7fa466eb13444551298b7"`
Sep 04 11:04:31.176 INFO kablam!     Checking flat-tree v1.1.0
Sep 04 11:04:32.028 INFO kablam!     Checking merkle-generator v0.2.0 (file:///source)
Sep 04 11:04:33.239 INFO kablam! warning: unused variable: `roots`
Sep 04 11:04:33.239 INFO kablam!    --> src/lib.rs:142:26
Sep 04 11:04:33.239 INFO kablam!     |
Sep 04 11:04:33.239 INFO kablam! 142 |     fn leaf(leaf: &Node, roots: &Vec<Node>) -> Vec<u8> {
Sep 04 11:04:33.239 INFO kablam!     |                          ^^^^^ help: consider using `_roots` instead
Sep 04 11:04:33.239 INFO kablam!     |
Sep 04 11:04:33.239 INFO kablam!     = note: #[warn(unused_variables)] on by default
Sep 04 11:04:33.239 INFO kablam! 
Sep 04 11:04:33.336 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 2.23s
Sep 04 11:04:33.340 INFO kablam! su: No module specific data is present
Sep 04 11:04:33.852 INFO running `"docker" "rm" "-f" "7247a0e9841540442bbc68b937c87b66c9aee56591c7fa466eb13444551298b7"`
Sep 04 11:04:34.003 INFO blam! 7247a0e9841540442bbc68b937c87b66c9aee56591c7fa466eb13444551298b7