`?` only helps if the thing you want to do on Err is return from the whole function. You can't use it for finer-grained break / continue / exit-from-current-blo

`?` only helps if the thing you want to do on Err is return from the whole function. You can't use it for finer-grained break / continue / exit-from-current-block (until `try` blocks are stabilized).