Is there any way to return from a function from inside a closure?

Question

I have the following simplified code:

fn f() -> i32 {
    let a = some_result.unwrap_or_else(|_| {
        return 1; // want to return this value from f &         


        

Answer 1

No, there is not.

A closure is a method (a kind of function) under the hood. You are asking for the ability to exit a parent function from an arbitrarily deeply nested function call. Such non-local flow control has generally proven to be extremely bad for programmer sanity and program maintenance.

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To solve your problem:

• How do you unwrap a Result on Ok or return from the function on Err?