Sep 21 05:02:20.693 INFO checking rbtree-0.1.5 against try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6 for pr-54394
Sep 21 05:02:20.693 INFO running: cargo +f1a3f05968ed2a674e09b6efa4ad9df90816e2b6-alt check --frozen --all --all-targets
Sep 21 05:02:20.693 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-54394/try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54394/worker-3/try#f1a3f05968ed2a674e09b6efa4ad9df90816e2b6:/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 +f1a3f05968ed2a674e09b6efa4ad9df90816e2b6-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "1536M" "crater"`
Sep 21 05:02:20.827 INFO blam! e386c7d4bfdd5de73de5614ba9893adeeccb52f8166d245ab2b308bca3ac4068
Sep 21 05:02:20.828 INFO running `"docker" "start" "-a" "e386c7d4bfdd5de73de5614ba9893adeeccb52f8166d245ab2b308bca3ac4068"`
Sep 21 05:02:21.520 INFO kablam! usermod: no changes
Sep 21 05:02:21.563 INFO kablam!     Checking rbtree v0.1.5 (/source)
Sep 21 05:02:21.794 INFO kablam! warning: unused import: `super::RBTree`
Sep 21 05:02:21.795 INFO kablam!     --> src/lib.rs:1404:9
Sep 21 05:02:21.795 INFO kablam!      |
Sep 21 05:02:21.795 INFO kablam! 1404 |     use super::RBTree;
Sep 21 05:02:21.795 INFO kablam!      |         ^^^^^^^^^^^^^
Sep 21 05:02:21.795 INFO kablam!      |
Sep 21 05:02:21.795 INFO kablam!      = note: #[warn(unused_imports)] on by default
Sep 21 05:02:21.795 INFO kablam! 
Sep 21 05:02:22.682 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 1.12s
Sep 21 05:02:22.686 INFO kablam! su: No module specific data is present
Sep 21 05:02:23.442 INFO running `"docker" "rm" "-f" "e386c7d4bfdd5de73de5614ba9893adeeccb52f8166d245ab2b308bca3ac4068"`
Sep 21 05:02:23.523 INFO blam! e386c7d4bfdd5de73de5614ba9893adeeccb52f8166d245ab2b308bca3ac4068