Root @ 0..17
  ComplexMessage @ 0..17
    ComplexBody @ 0..17
      QuotedPattern @ 0..17
        TOKEN LeftDoubleBraceToken @ 0..2 "{{"
        Pattern @ 2..15
          Text @ 2..15
            TOKEN TextToken @ 2..15 "Hello, world!"
        TOKEN RightDoubleBraceToken @ 15..17 "}}"
--diagnostics--
(none)
