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// Test that parent frames are shared when the older portions of two stacks are
// the same.
let f1, f2;
function dos() {
f1 = saveStack();
f2 = saveStack();
}
(function uno() {
dos();
}());
// Different youngest frames.
assertEq(f1 == f2, false);
// However the parents should be the same.
assertEq(f1.parent, f2.parent);