new_contents: # coding: utf8
  from __future__ import unicode_literals
  
  from spacy.matcher import Matcher
  from spacy.tokens import Token, Doc
  
  
  def test_issue1971(en_vocab):
      # Possibly related to #2675 and #2671?
      matcher = Matcher(en_vocab)
      pattern = [
          {"ORTH": "Doe"},
          {"ORTH": "!", "OP": "?"},
          {"_": {"optional": True}, "OP": "?"},
          {"ORTH": "!", "OP": "?"},
      ]
      Token.set_extension("optional", default=False)
      matcher.add("TEST", None, pattern)
      doc = Doc(en_vocab, words=["Hello", "John", "Doe", "!"])
      # We could also assert length 1 here, but this is more conclusive, because
      # the real problem here is that it returns a duplicate match for a match_id
      # that's not actually in the vocab!
      assert all(match_id in en_vocab.strings for match_id, start, end in matcher(doc))
  
subject: Add xfailing test (see #1971, #2675, #2671)