Sep 05 21:22:25.743 INFO checking unused_variable-1.0.0 against try#51ff957df5095d92d1d3d4682207ee8b7ad408a8 for pr-53854
Sep 05 21:22:25.743 INFO running: cargo +51ff957df5095d92d1d3d4682207ee8b7ad408a8-alt check --frozen --all --all-targets
Sep 05 21:22:25.743 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-1/pr-53854/try#51ff957df5095d92d1d3d4682207ee8b7ad408a8:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53854/worker-1/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 05 21:22:26.032 INFO blam! 87fc8d603b5ea1fb4c76388f79db90dcee1ad9ebc4c041973eba6281597bf667
Sep 05 21:22:26.038 INFO running `"docker" "start" "-a" "87fc8d603b5ea1fb4c76388f79db90dcee1ad9ebc4c041973eba6281597bf667"`
Sep 05 21:22:27.147 INFO kablam! usermod: no changes
Sep 05 21:22:27.191 INFO kablam!     Checking unused_variable v1.0.0 (file:///source)
Sep 05 21:22:27.599 INFO kablam! warning: expected `;`, found `<eof>`
Sep 05 21:22:27.599 INFO kablam!  --> <unused_variable macros>:1:32
Sep 05 21:22:27.599 INFO kablam!   |
Sep 05 21:22:27.599 INFO kablam! 1 | ( $ expr : expr ) => { let _ = $ expr }
Sep 05 21:22:27.600 INFO kablam!   |                                ^^^^^^
Sep 05 21:22:27.600 INFO kablam!   |
Sep 05 21:22:27.600 INFO kablam!   = note: This was erroneously allowed and will become a hard error in a future release
Sep 05 21:22:27.600 INFO kablam! 
Sep 05 21:22:27.635 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
Sep 05 21:22:27.645 INFO kablam! su: No module specific data is present
Sep 05 21:22:28.474 INFO running `"docker" "rm" "-f" "87fc8d603b5ea1fb4c76388f79db90dcee1ad9ebc4c041973eba6281597bf667"`
Sep 05 21:22:28.625 INFO blam! 87fc8d603b5ea1fb4c76388f79db90dcee1ad9ebc4c041973eba6281597bf667