let expected = 'o!o!o!'; let actual = ''; // g is a function that needs an implicit |this| if called within a |with| // statement. If we fail to provide that implicit |this|, it will append // "[object global]" instead of "o!". let o = { g: function() { actual += this.toString(); }, toString: function() { return "o!"; } } // g's presence within the |with| is detected by simple tracking of |with|s // during parsing. with (o) { (function() { g(); })(); } // The eval() defeats the tracking of |with| during parsing. Instead, g's // presence within the |with| is detected by looking at the scopeChain of the // ParseContext. with (o) { eval("(function() { g(); })()"); } // This is like the above case, but the knowledge of the |with| presence must // be inherited by the inner function. This is the case that was missed in bug // 786114. with (o) { eval("(function() { (function() { g(); })(); })()"); } assertEq(actual, expected);