def visit_List(self, node):
    return [self.visit(cst) for cst in node.elts]

  def visit_arguments(self, node):
    return [self.visit(arg) for arg in node.args]

  def visit_FunctionDef(self, node):
    # TODO(fengliuai): create one utility method to match different apis and
    # shared it with the tfr_gen.py module.
    compose_dec = []
    for dec in node.decorator_list:

            node)
      else:
        self._emit_with_loc(
            '\n{} = arith.constant {} : {}'.format(cst_name, cst_val, cst_ty),
            node)
    return cst_name, cst_ty

  def visit_FunctionDef(self, node):
    op_def, derived_attrs = self._op_defs.lookup(node.name, node, True)
    if op_def is None:
      # Nested function. Insert it to symbol table for looking up later.