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When a `?` operator is used in a tokio entry point function (wrapped in `#[tokio::main]`), which has a Option or Result return type, but where the function does not actually return that type correctly, currently the compiler returns two errors instead of just one. The first of which is incorrect and only exists due to the macro expanding to an async block. ``` cannot use the `?` operator in an async block that returns `()` ``` This commit is a characterization test for this behavior to help show when it's fixed (or even changed for better / worse)