class Parser::LexerStrings

def extend_interp_digit_var 

def extend_interp_digit_var
  if @version >= 27
    literal.extend_string(tok, @ts, @te)
  else
    message = tok.start_with?('#@@') ? :cvar_name : :ivar_name
    diagnostic :error, message, { :name => tok(@ts + 1, @te) }, range(@ts + 1, @te)
  end
end