parameters: (msg_type_name)
return_statement: return msg_type_name in BUILTIN_TYPES
docstring: :param msg_type_name: name of message type, ``str``
      :returns: True if msg_type_name is a builtin/primitive type, ``bool``
docstring_summary: :param msg_type_name: name of message type, ``str``
      :returns: True if msg_type_name is a builtin/primitive type, ``bool``
docstring_tokens: : param msg_type_name : name of message type str : returns : True if msg_type_name is a builtin / primitive type bool
function: def is_builtin(msg_type_name):
      """
      :param msg_type_name: name of message type, ``str``
      :returns: True if msg_type_name is a builtin/primitive type, ``bool``
      """
      return msg_type_name in BUILTIN_TYPES
function_tokens: def is_builtin ( msg_type_name ) : return msg_type_name in BUILTIN_TYPES