Sep 10 21:54:34.981 INFO checking bson-0.10.0 against master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1 for pr-54090
Sep 10 21:54:34.981 INFO running: cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets
Sep 10 21:54:34.981 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-6/pr-54090/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-6/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 21:54:35.152 INFO blam! 9688be7a7e5cd84ed6727a9fad81584a9d72af6e6f2c754076340523aef12546
Sep 10 21:54:35.155 INFO running `"docker" "start" "-a" "9688be7a7e5cd84ed6727a9fad81584a9d72af6e6f2c754076340523aef12546"`
Sep 10 21:54:36.156 INFO kablam! usermod: no changes
Sep 10 21:54:36.306 INFO kablam!     Checking bson v0.10.0 (file:///source)
Sep 10 21:54:39.494 INFO kablam! warning: unused variable: `tmp`
Sep 10 21:54:39.494 INFO kablam!  --> examples/test.rs:7:9
Sep 10 21:54:39.494 INFO kablam!   |
Sep 10 21:54:39.494 INFO kablam! 7 |     let tmp = bson::to_bson(&map).unwrap(); 
Sep 10 21:54:39.494 INFO kablam!   |         ^^^ help: consider using `_tmp` instead
Sep 10 21:54:39.494 INFO kablam!   |
Sep 10 21:54:39.494 INFO kablam!   = note: #[warn(unused_variables)] on by default
Sep 10 21:54:39.494 INFO kablam! 
Sep 10 21:54:40.494 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 4.31s
Sep 10 21:54:40.504 INFO kablam! su: No module specific data is present
Sep 10 21:54:41.096 INFO running `"docker" "rm" "-f" "9688be7a7e5cd84ed6727a9fad81584a9d72af6e6f2c754076340523aef12546"`
Sep 10 21:54:41.169 INFO blam! 9688be7a7e5cd84ed6727a9fad81584a9d72af6e6f2c754076340523aef12546