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// Promise.race(...) may add a dummy PromiseReaction which is only used for the
// debugger. Ensure that this dummy reaction can't influence the normal Promise
// resolution behaviour.
//
// See BlockOnPromise when called from PerformPromiseRace for when this dummy
// reaction is created.
function newPromiseCapability() {
var resolve, reject, promise = new Promise(function(r1, r2) {
resolve = r1;
reject = r2;
});
return {promise, resolve, reject};
}
function neverCalled() {
// Quit with non-zero exit code to ensure a test suite error is shown,
// even when this function is called within promise handlers which normally
// swallow any exceptions.
quit(1);
}
var c = 0;
var g_resolve;
var resolvedValues = [];
function resolveCapability(v) {
resolvedValues.push(v);
}
class P extends Promise {
constructor(executor) {
// Only the very first object created through this constructor gets
// special treatment, all other invocations create built-in Promise
// objects.
if (c++ > 1) {
return new Promise(executor);
}
executor(resolveCapability, neverCalled);
var {promise, resolve} = newPromiseCapability();
g_resolve = resolve;
// Use an async function to create a Promise without resolving functions.
var p = async function(){ await promise; return 456; }();
// Ensure the species constructor is not the built-in Promise constructor
// to avoid falling into the fast path.
p.constructor = {
[Symbol.species]: P
};
return p;
}
}
var {promise: alwaysPending} = newPromiseCapability();
// The promise returned from race() should never be resolved.
P.race([alwaysPending]).then(neverCalled, neverCalled);
g_resolve(123);
drainJobQueue();
// Check |resolvedValues| to ensure resolving functions were properly called.
assertEq(resolvedValues.length, 2);
assertEq(resolvedValues[0], alwaysPending);
assertEq(resolvedValues[1], 456);
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