src/Pure/Isar/token.scala

   def is_xname: Boolean = is_name || kind == Token.Kind.LONG_IDENT
   def is_text: Boolean = is_xname || kind == Token.Kind.VERBATIM
   def is_space: Boolean = kind == Token.Kind.SPACE
   def is_comment: Boolean = kind == Token.Kind.COMMENT
   def is_ignored: Boolean = is_space || is_comment
+  def is_unparsed: Boolean = kind == Token.Kind.UNPARSED
 
   def is_begin: Boolean = kind == Token.Kind.KEYWORD && source == "begin"
   def is_end: Boolean = kind == Token.Kind.COMMAND && source == "end"
 
   def content: String =