michael@0: // Map(x) throws if x is not iterable (unless x is undefined).
michael@0: 
michael@0: load(libdir + "asserts.js");
michael@0: var nonIterables = [null, true, 1, -0, 3.14, NaN, {}, Math, this];
michael@0: for (let k of nonIterables)
michael@0:     assertThrowsInstanceOf(function () { Map(k); }, TypeError);