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

fn baz() -> ! { fail; }

fn foo() {
    alt some::<int>(5) {
      some::<int>(x) {
        let bar;
        alt none::<int> { none::<int>. { bar = 5; } _ { baz(); } }
        log bar;
      }
      none::<int>. { log "hello"; }
    }
}

fn main() { foo(); }