REGEXP_FILE
  RegExpPatternImpl: <(?P<name>{>
    RegExpBranchImpl: <(?P<name>{>
      RegExpGroupImpl: <(?P<name>{>
        PsiElement(PYTHON_NAMED_GROUP)('(?P<')
        PsiElement(NAME)('name')
        PsiElement(GT)('>')
        RegExpPatternImpl: <{>
          RegExpBranchImpl: <{>
            PsiErrorElement:Unexpected start of quantifier '{'
              <empty list>
            PsiElement(LBRACE)('{')
        PsiErrorElement:')' expected
          <empty list>