Aug 18 02:37:20.067 INFO checking bson-0.12.3 against master#142bb27373126edf8367f526358b6c72ecf1d8df for pr-53426
Aug 18 02:37:20.067 INFO running: cargo +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets
Aug 18 02:37:20.067 INFO creating container for: cargo +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets
Aug 18 02:37:20.067 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53426/master#142bb27373126edf8367f526358b6c72ecf1d8df:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53426/worker-0/master#142bb27373126edf8367f526358b6c72ecf1d8df:/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 +142bb27373126edf8367f526358b6c72ecf1d8df-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "crater"`
Aug 18 02:37:20.261 INFO blam! f21fe59da60eef522493cb286849145b98022784b3965f41b8b5002b030d9fcd
Aug 18 02:37:20.266 INFO running `"docker" "start" "-a" "f21fe59da60eef522493cb286849145b98022784b3965f41b8b5002b030d9fcd"`
Aug 18 02:37:21.137 INFO kablam!     Checking bson v0.12.3 (file:///source)
Aug 18 02:37:33.834 INFO kablam! warning: unused variable: `tmp`
Aug 18 02:37:33.834 INFO kablam!  --> examples/test.rs:7:9
Aug 18 02:37:33.834 INFO kablam!   |
Aug 18 02:37:33.834 INFO kablam! 7 |     let tmp = bson::to_bson(&map).unwrap();
Aug 18 02:37:33.834 INFO kablam!   |         ^^^ help: consider using `_tmp` instead
Aug 18 02:37:33.834 INFO kablam!   |
Aug 18 02:37:33.834 INFO kablam!   = note: #[warn(unused_variables)] on by default
Aug 18 02:37:33.834 INFO kablam! 
Aug 18 02:37:37.691 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 16.67s
Aug 18 02:37:37.720 INFO kablam! su: No module specific data is present
Aug 18 02:37:38.283 INFO running `"docker" "rm" "-f" "f21fe59da60eef522493cb286849145b98022784b3965f41b8b5002b030d9fcd"`
Aug 18 02:37:38.530 INFO blam! f21fe59da60eef522493cb286849145b98022784b3965f41b8b5002b030d9fcd