delegating-yield-1.js

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// This file was written by Andy Wingo <wingo@igalia.com> and originally

// contributed to V8 as generators-objects.js, available here:

//

// http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-objects.js

// Test that yield* re-yields received results without re-boxing.

function results(results) {

    var i = 0;

    function next() {

        return results[i++];

    var iter = { next: next }

    var ret = {};

    ret[Symbol.iterator] = function () { return iter; }

    return ret;

function* yield_results(expected) {

    return yield* results(expected);

function collect_results(iterable) {

    var ret = [];

    var result;

    var iter = iterable[Symbol.iterator]();

    do {

        result = iter.next();

        ret.push(result);

    } while (!result.done);

    return ret;

// We have to put a full result for the end, because the return will re-box.

var expected = [{value: 1}, {value: 34, done: true}];

// Sanity check.

assertDeepEq(expected, collect_results(results(expected)));

assertDeepEq(expected, collect_results(yield_results(expected)));

if (typeof reportCompare == "function")

    reportCompare(true, true);