next-arity.js - mozsearch

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// For-of passes one arg to "next".

load(libdir + 'iteration.js')

var log = '';

function Iter() {

    function next() {

        log += 'n';

        assertEq(arguments.length, 0)

        assertEq(arguments[0], undefined)

        return { get value() { throw 42; }, done: true }

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

    this.next = next;

for (var x of new Iter())

    throw 'not reached';

assertEq(log, 'n');