* 実装

[REFS[
- [1] [CITE@en-US[Error - JavaScript | MDN]]
( ([TIME[2012-10-29 12:26:49 +09:00]] 版))
<https://developer.mozilla.org/en/docs/JavaScript/Reference/Global_Objects/Error>
- [CITE@en-us[Error Object]]
( ([TIME[2012-11-25 02:44:09 +09:00]] 版))
<http://msdn.microsoft.com/en-us/library/vstudio/t9zk6eay(v=vs.100).aspx>
]REFS]