class Liquid::Error

def message_prefix
  str = +""
  str << if is_a?(SyntaxError)
    "Liquid syntax error"
  else
    "Liquid error"
  end
  if line_number
    str << " ("
    str << template_name << " " if template_name
    str << "line " << line_number.to_s << ")"
  end
  str << ": "
  str
end

def to_s(with_prefix = true)
  str = +""
  str << message_prefix if with_prefix
  str << super()
  if markup_context
    str << " "
    str << markup_context
  end
  str
end