Sep 10 13:31:03.249 INFO checking optional_struct-0.2.0 against master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1 for pr-54090
Sep 10 13:31:03.249 INFO running: cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets
Sep 10 13:31:03.249 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-54090/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-2/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 13:31:03.487 INFO blam! 152d0ea59d5fb27479c0574cf2b6507eb027ea3bc42438a2f1f408e8d66ee0a2
Sep 10 13:31:03.488 INFO running `"docker" "start" "-a" "152d0ea59d5fb27479c0574cf2b6507eb027ea3bc42438a2f1f408e8d66ee0a2"`
Sep 10 13:31:04.383 INFO kablam! usermod: no changes
Sep 10 13:31:04.450 INFO kablam!    Compiling optional_struct v0.2.0 (file:///source)
Sep 10 13:31:07.026 INFO kablam! warning: struct is never constructed: `Config`
Sep 10 13:31:07.026 INFO kablam!  --> tests/empty.rs:5:1
Sep 10 13:31:07.026 INFO kablam!   |
Sep 10 13:31:07.026 INFO kablam! 5 | struct Config {
Sep 10 13:31:07.026 INFO kablam!   | ^^^^^^^^^^^^^
Sep 10 13:31:07.026 INFO kablam!   |
Sep 10 13:31:07.026 INFO kablam!   = note: #[warn(dead_code)] on by default
Sep 10 13:31:07.026 INFO kablam! 
Sep 10 13:31:07.100 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 2.68s
Sep 10 13:31:07.103 INFO kablam! su: No module specific data is present
Sep 10 13:31:07.701 INFO running `"docker" "rm" "-f" "152d0ea59d5fb27479c0574cf2b6507eb027ea3bc42438a2f1f408e8d66ee0a2"`
Sep 10 13:31:07.780 INFO blam! 152d0ea59d5fb27479c0574cf2b6507eb027ea3bc42438a2f1f408e8d66ee0a2