Sep 03 23:27:12.678 INFO checking unused_variable-1.0.0 against master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c for pr-53893
Sep 03 23:27:12.678 INFO running: cargo +28bcffead74d5e17c6cb1f7de432e37f93a6b50c-alt check --frozen --all --all-targets
Sep 03 23:27:12.678 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 03 23:27:12.937 INFO blam! 4f42ff3ccd6bd33305bf176e5bd0c4e6c3b8fb70e5e980aac6254b6fdcc0f367
Sep 03 23:27:12.940 INFO running `"docker" "start" "-a" "4f42ff3ccd6bd33305bf176e5bd0c4e6c3b8fb70e5e980aac6254b6fdcc0f367"`
Sep 03 23:27:13.911 INFO kablam!     Checking unused_variable v1.0.0 (file:///source)
Sep 03 23:27:14.524 INFO kablam! warning: expected `;`, found `<eof>`
Sep 03 23:27:14.524 INFO kablam!  --> <unused_variable macros>:1:32
Sep 03 23:27:14.524 INFO kablam!   |
Sep 03 23:27:14.524 INFO kablam! 1 | ( $ expr : expr ) => { let _ = $ expr }
Sep 03 23:27:14.524 INFO kablam!   |                                ^^^^^^
Sep 03 23:27:14.525 INFO kablam!   |
Sep 03 23:27:14.525 INFO kablam!   = note: This was erroneously allowed and will become a hard error in a future release
Sep 03 23:27:14.525 INFO kablam! 
Sep 03 23:27:14.588 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.71s
Sep 03 23:27:14.598 INFO kablam! su: No module specific data is present
Sep 03 23:27:15.150 INFO running `"docker" "rm" "-f" "4f42ff3ccd6bd33305bf176e5bd0c4e6c3b8fb70e5e980aac6254b6fdcc0f367"`
Sep 03 23:27:15.315 INFO blam! 4f42ff3ccd6bd33305bf176e5bd0c4e6c3b8fb70e5e980aac6254b6fdcc0f367