private boolean parseMaybeSequencePatternWithoutParentheses() {
    SyntaxTreeBuilder.Marker mark = myBuilder.mark();
    CommaSeparation result = parseCommaSeparatedPatterns(this::parsePattern);
    if (result != CommaSeparation.NO_ELEMENTS) {
      if (result == CommaSeparation.EXISTS) {
        mark.done(PyElementTypes.SEQUENCE_PATTERN);
      }
      else {
        mark.drop();
      }
      return true;
    }
    mark.drop();
    return false;
  }
private boolean parseMaybeSequencePatternWithoutParentheses()