Root @ 0..11
  SimpleMessage @ 0..11
    Pattern @ 0..11
      Placeholder @ 0..11
        Markup @ 0..11
          TOKEN LeftBraceToken @ 0..1 "{"
          TOKEN HashToken @ 1..2 "#"
          Identifier @ 2..5
            TOKEN NameToken @ 2..5 "tag"
          Attribute @ 5..10
            TOKEN AtToken @ 5..6 "@"
            Identifier @ 6..10
              TOKEN NameToken @ 6..10 "attr"
          TOKEN RightBraceToken @ 10..11 "}"
--diagnostics--
MissingRequiredWhitespace @ 5..5 (line 1, col 6): missing required whitespace between productions
