rust/src/test/run-pass/alt-join.rs

use std;
import option;

fn foo<T>(y: option<T>) {
    let mut x: int;
    let mut rs: ~[int] = ~[];
    /* tests that x doesn't get put in the precondition for the
       entire if expression */

    if true {
    } else { alt y { none::<T> { x = 17; } _ { x = 42; } } rs += ~[x]; }
    ret;
}

fn main() { #debug("hello"); foo::<int>(some::<int>(5)); }