Sep 01 20:08:36.190 INFO checking unused_variable-1.0.0 against master#1114ab684fbad001c4e580326d8eb4d8c4e917d3 for pr-53851
Sep 01 20:08:36.190 INFO running: cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets
Sep 01 20:08:36.190 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53851/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53851/worker-0/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/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 +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 01 20:08:36.393 INFO blam! 88c15c91f991147585c310ef1f5210837b4dbf4deecfe5787d996a2321c4c68e
Sep 01 20:08:36.396 INFO running `"docker" "start" "-a" "88c15c91f991147585c310ef1f5210837b4dbf4deecfe5787d996a2321c4c68e"`
Sep 01 20:08:37.053 INFO kablam!     Checking unused_variable v1.0.0 (file:///source)
Sep 01 20:08:37.404 INFO kablam! warning: expected `;`, found `<eof>`
Sep 01 20:08:37.405 INFO kablam!  --> <unused_variable macros>:1:32
Sep 01 20:08:37.405 INFO kablam!   |
Sep 01 20:08:37.405 INFO kablam! 1 | ( $ expr : expr ) => { let _ = $ expr }
Sep 01 20:08:37.405 INFO kablam!   |                                ^^^^^^
Sep 01 20:08:37.405 INFO kablam!   |
Sep 01 20:08:37.405 INFO kablam!   = note: This was erroneously allowed and will become a hard error in a future release
Sep 01 20:08:37.405 INFO kablam! 
Sep 01 20:08:37.440 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.40s
Sep 01 20:08:37.445 INFO kablam! su: No module specific data is present
Sep 01 20:08:37.812 INFO running `"docker" "rm" "-f" "88c15c91f991147585c310ef1f5210837b4dbf4deecfe5787d996a2321c4c68e"`
Sep 01 20:08:37.904 INFO blam! 88c15c91f991147585c310ef1f5210837b4dbf4deecfe5787d996a2321c4c68e