code: def visit_nat(self, node, visited_children):
      _, [nat], _ = visited_children
      return nat
  
imports: from parsimonious import Grammar, NodeVisitor
  from hail.expr.nat import NatVariable
  from .None import types
  from hail.utils.java import unescape_parsable
label_desc: Use image node_id 26 for calling the TypeConstructor obj's underlying member method code with example usage: obj.visit_nat(node, visited_children) and returns: nat