Introducing an “Unwrap or Throw” operator

[mayoff (Rob Mayoff)]

I have been using this solution for ages and haven't felt a need for a custom operator or a method on Optional:

Unwrap or Throw - Make the Safe Choice Easier

You could play with the idiom by putting a simple wrapper function around throw today: // could be -> Never when Never-as-bottom is implemented func raise<T>(_ error: Error) throws -> T { throw error } try value ?? raise(Errors.falseResult) We originally decided against making throw an expression because it would be inconsistent with other control flow statements like break, continue, and return. With Never in the type system, and rethrows autoclosures, we could conceivably make it so that b…

A standard UnexpectedNil error might be nice though.