class_docstr: A visitor over Type.
  
  The default behavior recursively traverses the AST.
code: def visit_type_data(self, td):
      self.visit(td.header)
      for type_var in td.type_vars:
          self.visit(type_var)
  
imports: from .ty import TypeVar, IncompleteType, TensorType, FuncType, TupleType, TypeRelation, RefType, GlobalTypeVar, TypeCall
  from .adt import TypeData
label_desc: Use image node_id 10 for calling the TypeVisitor obj's underlying member method code with example usage: obj.visit_type_data(td) without return types