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

use std;
import std::option;
import std::option::t;
import std::option::none;
import std::option::some;

fn foo[T](y: &option::t<T>) {
    let x: int;
    let 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() { log "hello"; foo[int](some[int](5)); }