Root @ 0..14
  ComplexMessage @ 0..14
    ComplexBody @ 0..14
      QuotedPattern @ 0..14
        TOKEN LeftDoubleBraceToken @ 0..2 "{{"
        Pattern @ 2..14
          Text @ 2..14
            TOKEN TextToken @ 2..14 "unterminated"
--diagnostics--
UnclosedQuotedPattern @ 0..14 (line 1, col 1): unclosed quoted pattern
