Bug 852016 - Watch for uses of 'arguments' in eval() inside generator expressions, r=luke.

js/src/frontend/BytecodeCompiler.cpp

@@ -66,6 +66,12 @@ CheckArgumentsWithinEval(JSContext *cx, Parser<FullParseHandler> &parser, Handle
             return false;
     }
 
+    // It's an error to use |arguments| in a generator expression.
+    if (script->isGeneratorExp) {
+        parser.report(ParseError, false, NULL, JSMSG_BAD_GENEXP_BODY, js_arguments_str);
+        return false;
+    }
+
     return true;
 }