michael@0: // Constant folding doesn't affect strict delete either.
michael@0: // In particular, it doesn't affect whether |delete x| is a strict error.
michael@0: 
michael@0: load(libdir + "asserts.js");
michael@0: 
michael@0: (function (x) {
michael@0:     "use strict";
michael@0: 
michael@0:     // These senseless delete-expressions are legal even in strict mode.
michael@0:     // Per ES5.1 11.4.1 step 2, 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:     // Plain `delete x` is a SyntaxError though.
michael@0:     assertThrowsInstanceOf(() => eval('delete x'), SyntaxError);
michael@0:     assertThrowsInstanceOf(() => Function('"use strict"; delete x'), SyntaxError);
michael@0: }());