bug-888002-3.js (660B)
1 // Constant folding doesn't affect strict delete either. 2 // In particular, it doesn't affect whether |delete x| is a strict error. 3 4 load(libdir + "asserts.js"); 5 6 (function (x) { 7 "use strict"; 8 9 // These senseless delete-expressions are legal even in strict mode. 10 // Per ES5.1 11.4.1 step 2, each one does nothing and returns true. 11 assertEq(delete (1 ? x : x), true); 12 assertEq(delete (0 || x), true); 13 assertEq(delete (1 && x), true); 14 15 // Plain `delete x` is a SyntaxError though. 16 assertThrowsInstanceOf(() => eval('delete x'), SyntaxError); 17 assertThrowsInstanceOf(() => Function('"use strict"; delete x'), SyntaxError); 18 }());