rust/src/test/run-pass/alt-pattern-drop.rs

// -*- rust -*-
use std;
import std::str;


// FIXME: import std::dbg.const_refcount. Currently
// cross-crate const references don't work.
const uint const_refcount = 0x7bad_face_u;

tag t { make_t(str); clam; }

fn foo(str s) {
    let t x = make_t(s); // ref up

    alt (x) {
        case (make_t(?y)) {
            log y; // ref up then down

        }
        case (_) { log "?"; fail; }
    }
    log str::refcount(s);
    assert (str::refcount(s) == const_refcount);
}

fn main() {
    let str s = "hi"; // ref up

    foo(s); // ref up then down

    log str::refcount(s);
    assert (str::refcount(s) == const_refcount);
}