Map-set-returns-this.js

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// Bug 1031632 - Map.prototype.set, WeakMap.prototype.set and

// Set.prototype.add should be chainable

var m = new Map();

assertEq(m.set('oof', 'RAB'), m);

var a = m.set('foo', 'BAR').get('foo');

assertEq(a, 'BAR');