code: def test_issue3555(en_vocab):
      """Test that custom extensions with default None don't break matcher."""
      Token.set_extension("issue3555", default=None)
      matcher = Matcher(en_vocab)
      pattern = [{"ORTH": "have"}, {"_": {"issue3555": True}}]
      matcher.add("TEST", [pattern])
      doc = Doc(en_vocab, words=["have", "apple"])
      matcher(doc)
  
imports: import re
  import pytest
  from spacy.attrs import IS_PUNCT, LOWER, ORTH
  from spacy.errors import MatchPatternError
  from spacy.lang.en import English
  from spacy.lang.lex_attrs import LEX_ATTRS
  from spacy.matcher import Matcher
  from spacy.tokens import Doc, Span, Token
  from spacy.vocab import Vocab
label_desc: Use image node_id 25 for calling a global function with example usage: test_issue3555(en_vocab) without return types