| // Constant folding doesn't affect strict delete either. |
| // In particular, it doesn't affect whether |delete x| is a strict error. |
| |
| load(libdir + "asserts.js"); |
| |
| (function (x) { |
| "use strict"; |
| |
| // These senseless delete-expressions are legal even in strict mode. |
| // Per ES5.1 11.4.1 step 2, each one does nothing and returns true. |
| assertEq(delete (1 ? x : x), true); |
| assertEq(delete (0 || x), true); |
| assertEq(delete (1 && x), true); |
| |
| // Plain `delete x` is a SyntaxError though. |
| assertThrowsInstanceOf(() => eval('delete x'), SyntaxError); |
| assertThrowsInstanceOf(() => Function('"use strict"; delete x'), SyntaxError); |
| }()); |