Something like this came up in passing in this thread from last summer. To avoid breakage, it was suggested to annotate the closure to indicate that it might have control-flow effects on the outer scope:
let connection = get_connection().or_else(do |err|
return Outcome::Failure((Status::InternalServerError, err)));
I don’t have a strong opinion on the idea in general: yeah, if we had that I would probably find uses for it, but so far (which isn’t very far) I don’t feel I need it.