code: def test_matcher_operator_shadow(en_vocab):
      matcher = Matcher(en_vocab)
      doc = Doc(matcher.vocab, words=["a", "b", "c"])
      pattern = [
          {"ORTH": "a"},
          {"IS_ALPHA": True, "OP": "+"},
          {"ORTH": "c"},
      ]
      matcher.add("A.C", [pattern])
      matches = matcher(doc)
      assert len(matches) == 1
      assert matches[0][1:] == (0, 3)
  
imports: import pytest
  from mock import Mock
  from spacy.matcher import Matcher
  from spacy.tokens import Doc, Span, Token
  from ..doc.test_underscore import clean_underscore
label_desc: Use image node_id 20 for calling a global function with example usage: test_matcher_operator_shadow(en_vocab) without return types