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function newPromiseCapability() {
var resolve, reject, promise = new Promise(function(r1, r2) {
resolve = r1;
reject = r2;
});
return {promise, resolve, reject};
}
var {promise, resolve} = newPromiseCapability();
resolve(Promise.resolve(0));
// Don't assert when the Promise was already resolved.
resolvePromise(promise, 123);