bug786114.js (952B)
1 let expected = 'o!o!o!'; 2 let actual = ''; 3 4 // g is a function that needs an implicit |this| if called within a |with| 5 // statement. If we fail to provide that implicit |this|, it will append 6 // "[object global]" instead of "o!". 7 let o = { 8 g: function() { actual += this.toString(); }, 9 toString: function() { return "o!"; } 10 } 11 12 // g's presence within the |with| is detected by simple tracking of |with|s 13 // during parsing. 14 with (o) { 15 (function() { g(); })(); 16 } 17 18 // The eval() defeats the tracking of |with| during parsing. Instead, g's 19 // presence within the |with| is detected by looking at the scopeChain of the 20 // ParseContext. 21 with (o) { 22 eval("(function() { g(); })()"); 23 } 24 25 // This is like the above case, but the knowledge of the |with| presence must 26 // be inherited by the inner function. This is the case that was missed in bug 27 // 786114. 28 with (o) { 29 eval("(function() { (function() { g(); })(); })()"); 30 } 31 32 assertEq(actual, expected);