Generated visitor missing superclass methods

[janyou]

Generated visitor missing superclass methods

[janyou]

Should you use the ExprBaseVisitor class?

[janyou]

ExprVisitor and ExprBaseVisitor function is not the same.
ExprBaseVisitor default call visitChildren.

public  class ExprContext: ParserRuleContext {
             .......
        override
        public func accept<T>(visitor: ParseTreeVisitor<T>) -> T? {
            if visitor is ExprVisitor {
                 return (visitor as! ExprVisitor<T>).visitExpr(self)
            }
            else {
                 return visitor.visitChildren(self)
            }
        }
    }