Returns

The return statement allows you to early-return any body expression.

In functions this means that the following code will return "20" instead of "40"

double := fn(x) {  return 20  return 40}

A return statement will only return the nearest block. Meaning that the following will not return it's outer function:

outer := fn(x) {  return fn() {    return 20  }()}

There is one exception to this rule, which is if it's used in a loop. For example, this will return the outer block (and stop the loop):

function := fn() {  for (true) {    return 20  }}