can break out of a self-executing closure

[thehowl]

In today's episode of "Wouldn't It Be Funny If This Actually Worked?"

package main

func main() {
	for i := 0; i < 10; i++ {
		if i == 1 {
			_ = func() int {
				break
				return 11
			}()
		}
		println(i)
	}
	println("wat???")
}

Of course, this code isn't meant to compile, but Gno's output is a simple and somewhat disarming:

0
wat???

[thehowl]

This can likely work for continue and possibly also fallthrough, so a fix should verify the correct behaviour for all three statements.