class RubyMemcheck::ValgrindError

def to_s
  str = StringIO.new
  str << "#{msg}\n"
  stack.frames.each do |frame|
    str << if frame.in_binary?
      " *#{frame}\n"
    else
      "  #{frame}\n"
    end
  end
  str << suppression.to_s if suppression
  str.string
end