js/src/jit-test/tests/basic/delete-last-check-proto.js


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// Test that removing a non-dictionary property does not roll back the object's
// shape to the previous one if the protos are different.

var o = {x: 1};
o.y = 2;
Object.setPrototypeOf(o, null);
delete o.y;
assertEq(Object.getPrototypeOf(o), null);