bug504587-1.js - mozsearch

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// This test case failed a WIP patch. See https://bugzilla.mozilla.org/show_bug.cgi?id=504587#c68

function B() {}

B.prototype.x = 1;

var d = new B;

var names = ['z', 'z', 'z', 'z', 'z', 'z', 'z', 'x'];

for (var i = 0; i < names.length; i++) {

    x = d.x;  // guard on shapeOf(d)

    d[names[i]] = 2;  // unpredicted shape change

    y = d.x;  // guard here is elided

assertEq(y, 2);  // Assertion failed: got 1, expected 2