michael@0: // Constant folding doesn't affect non-strict delete.
michael@0: 
michael@0: (function (x) {
michael@0:     // These senseless delete-expressions are legal. Per ES5.1 11.4.1 step 2,
michael@0:     // each one does nothing and returns true.
michael@0:     assertEq(delete (1 ? x : x), true);
michael@0:     assertEq(delete (0 || x), true);
michael@0:     assertEq(delete (1 && x), true);
michael@0: 
michael@0:     // This one is legal too, but returns false.
michael@0:     assertEq(delete x, false);
michael@0: }());