rust/src/test/run-pass/nested-pattern.rs

// a bug was causing this to complain about leaked memory on exit
use std;
import option;
import option::some;
import option::none;

enum t { foo(int, uint), bar(int, option::t<int>), }

fn nested(o: t) {
    alt o {
      bar(i, some::<int>(_)) { #error("wrong pattern matched"); fail; }
      _ { #error("succeeded"); }
    }
}

fn main() { nested(bar(1, none::<int>)); }