[Sharlin]

As others have said, you can `and_then` chain `Options`, but often it’s better to convert each `Option` into a `Result`s before chaining, to get more fine-grained error messages as shown in the fine article. But usually it’s cleaner and more convenient (and friendlier to people used to exceptions) to use the `?` operator which is basically Rust’s `do` notation except that currently you can only early-return from the entire function with it, not escape a specific block. Which in turn requires the types to match, though Rust does at least insert an `.into()` conversion for the error value.