code: def visit_leaf(self, leaf):
      self._check_type_rules(leaf)
  
      for rule in self._rule_value_instances.get(leaf.value, []):
          rule.feed_node(leaf)
  
      return leaf.prefix + leaf.value
  
imports: from contextlib import contextmanager
  from typing import Dict, List
label_desc: Use image node_id 7 for calling the Normalizer obj's underlying member method code with example usage: obj.visit_leaf(leaf) and returns: unknown