michael@0: function testBug502914() {
michael@0:     // Assigning a non-function to a function-valued property on trace should
michael@0:     // bump the shape.
michael@0:     function f1() {}
michael@0:     function C() {}
michael@0:     var x = C.prototype = {m: f1};
michael@0:     x.m();  // brand scope
michael@0:     var arr = [new C, new C, new C, x];
michael@0:     try {
michael@0:         for (var i = 0; i < 4; i++) {
michael@0:             arr[i].m = 12;
michael@0:             x.m();  // should throw last time through
michael@0:         }
michael@0:     } catch (exc) {
michael@0:         return exc.constructor.name;
michael@0:     }
michael@0:     return "no exception";
michael@0: }
michael@0: assertEq(testBug502914(), "TypeError");