System.err.println("access to " + self + " in " + filter);
                        public void visitFieldExpression(JFieldAccessExpression self,                                                         JExpression left,                                                         String ident) {                            // if we are in assignment, mark that there is mutable state                            if (inAssignment[0]) {                                System.err.println("access to " + self + " in " + filter);                                foundMutable[0] = true;                            }                            super.visitFieldExpression(self, left, ident);                        }