Issue #81 has been reported by Ken DATE.

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Bug #81: Set#delete で削除が行われないのはどんなとき？
http://redmine.ruby-lang.org/issues/show/81

Author: Ken DATE
Status: Open
Priority: Low
Assigned to: 
Category: doc
Target version: 
reporter: rock
ruby_version: 1.8,1.9


Set#delete の説明で，削除が行われないのはどんな場合か，が書いてありません。
「オブジェクト o が self の要素でない場合は何も起こりません」とかなんとか。


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