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// |reftest| skip-if(!xulRuntime.shell) -- needs drainJobQueue
var BUGNUMBER = 1185106;
var summary = "async functions semantics";
print(BUGNUMBER + ": " + summary);
async function empty() {
}
assertEventuallyEq(empty(), undefined);
async function simpleReturn() {
return 1;
}
assertEventuallyEq(simpleReturn(), 1);
async function simpleAwait() {
var result = await 2;
return result;
}
assertEventuallyEq(simpleAwait(), 2);
async function simpleAwaitAsync() {
var result = await simpleReturn();
return 2 + result;
}
assertEventuallyEq(simpleAwaitAsync(), 3);
async function returnOtherAsync() {
return 1 + await simpleAwaitAsync();
}
assertEventuallyEq(returnOtherAsync(), 4);
async function simpleThrower() {
throw new Error();
}
assertEventuallyThrows(simpleThrower(), Error);
async function delegatedThrower() {
var val = await simpleThrower();
return val;
}
async function tryCatch() {
try {
await delegatedThrower();
return 'FAILED';
} catch (_) {
return 5;
}
}
assertEventuallyEq(tryCatch(), 5);
async function tryCatchThrow() {
try {
await delegatedThrower();
return 'FAILED';
} catch (_) {
return delegatedThrower();
}
}
assertEventuallyThrows(tryCatchThrow(), Error);
async function wellFinally() {
try {
await delegatedThrower();
} catch (_) {
return 'FAILED';
} finally {
return 6;
}
}
assertEventuallyEq(wellFinally(), 6);
async function finallyMayFail() {
try {
await delegatedThrower();
} catch (_) {
return 5;
} finally {
return delegatedThrower();
}
}
assertEventuallyThrows(finallyMayFail(), Error);
async function embedded() {
async function inner() {
return 7;
}
return await inner();
}
assertEventuallyEq(embedded(), 7);
// recursion, it works!
async function fib(n) {
return (n == 0 || n == 1) ? n : await fib(n - 1) + await fib(n - 2);
}
assertEventuallyEq(fib(6), 8);
// mutual recursion
async function isOdd(n) {
async function isEven(n) {
return n === 0 || await isOdd(n - 1);
}
return n !== 0 && await isEven(n - 1);
}
assertEventuallyEq(isOdd(12).then(v => v ? "oops" : 12), 12);
// recursion, take three!
var hardcoreFib = async function fib2(n) {
return (n == 0 || n == 1) ? n : await fib2(n - 1) + await fib2(n - 2);
}
assertEventuallyEq(hardcoreFib(7), 13);
var asyncExpr = async function() {
return 10;
}
assertEventuallyEq(asyncExpr(), 10);
var namedAsyncExpr = async function simple() {
return 11;
}
assertEventuallyEq(namedAsyncExpr(), 11);
async function executionOrder() {
var value = 0;
async function first() {
return (value = value === 0 ? 1 : value);
}
async function second() {
return (value = value === 0 ? 2 : value);
}
async function third() {
return (value = value === 0 ? 3 : value);
}
return await first() + await second() + await third() + 6;
}
assertEventuallyEq(executionOrder(), 9);
async function miscellaneous() {
if (arguments.length === 3 &&
arguments.callee.name === "miscellaneous")
return 14;
}
assertEventuallyEq(miscellaneous(1, 2, 3), 14);
function thrower() {
throw 15;
}
async function defaultArgs(arg = thrower()) {
}
assertEventuallyEq(defaultArgs().catch(e => e), 15);
let arrowAwaitExpr = async () => await 2;
assertEventuallyEq(arrowAwaitExpr(), 2);
let arrowAwaitBlock = async () => { return await 2; };
assertEventuallyEq(arrowAwaitBlock(), 2);
// Async functions are not constructible
assertThrowsInstanceOf(() => {
async function Person() {
}
new Person();
}, TypeError);
if (typeof reportCompare === "function")
reportCompare(true, true);
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