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     27 
     28 // Regexp shouldn't use String.prototype.slice()
     29 var s = new String("foo");
     30 assertEquals("f", s.slice(0,1));
     31 String.prototype.slice = function() { return "x"; };
     32 assertEquals("x", s.slice(0,1));
     33 assertEquals(["g"], /g/.exec("gg"));
     34 
     35 // Regexp shouldn't use String.prototype.charAt()
     36 var f1 = new RegExp("f", "i");
     37 assertEquals(["F"], f1.exec("F"));
     38 assertEquals("f", "foo".charAt(0));
     39 String.prototype.charAt = function(idx) { return 'g'; };
     40 assertEquals("g", "foo".charAt(0));
     41 var f2 = new RegExp("[g]", "i");
     42 assertEquals(["G"], f2.exec("G"));
     43 assertTrue(f2.ignoreCase);
     44 
     45 // On the other hand test is defined in a semi-coherent way as a call to exec.
     46 // 15.10.6.3
     47 // We match other browsers in using the original value of RegExp.prototype.exec.
     48 // I.e., RegExp.prototype.test shouldn't use the current value of
     49 // RegExp.prototype.exec.
     50 RegExp.prototype.exec = function(string) { return 'x'; };
     51 assertFalse(/f/.test('x'));
     52