Sep 10 12:10:12.101 INFO checking rbtree-0.1.5 against master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1 for pr-54090
Sep 10 12:10:12.101 INFO running: cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets
Sep 10 12:10:12.101 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-54090/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-3/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/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 +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-m" "2G" "crater"`
Sep 10 12:10:12.265 INFO blam! 82d4614f81e57c3810e0f5312549f9dd9ee6bcf86e1452b2fbcaa652a26282e2
Sep 10 12:10:12.267 INFO running `"docker" "start" "-a" "82d4614f81e57c3810e0f5312549f9dd9ee6bcf86e1452b2fbcaa652a26282e2"`
Sep 10 12:10:12.971 INFO kablam! usermod: no changes
Sep 10 12:10:12.999 INFO kablam!     Checking rbtree v0.1.5 (file:///source)
Sep 10 12:10:13.409 INFO kablam! warning: unused import: `super::RBTree`
Sep 10 12:10:13.409 INFO kablam!     --> src/lib.rs:1404:9
Sep 10 12:10:13.409 INFO kablam!      |
Sep 10 12:10:13.409 INFO kablam! 1404 |     use super::RBTree;
Sep 10 12:10:13.409 INFO kablam!      |         ^^^^^^^^^^^^^
Sep 10 12:10:13.409 INFO kablam!      |
Sep 10 12:10:13.409 INFO kablam!      = note: #[warn(unused_imports)] on by default
Sep 10 12:10:13.409 INFO kablam! 
Sep 10 12:10:14.578 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 1.59s
Sep 10 12:10:14.580 INFO kablam! su: No module specific data is present
Sep 10 12:10:15.311 INFO running `"docker" "rm" "-f" "82d4614f81e57c3810e0f5312549f9dd9ee6bcf86e1452b2fbcaa652a26282e2"`
Sep 10 12:10:15.409 INFO blam! 82d4614f81e57c3810e0f5312549f9dd9ee6bcf86e1452b2fbcaa652a26282e2