Bug #3192: Missing Set#keep_if, select!  [patch]
http://redmine.ruby-lang.org/issues/show/3192

Author: Marc-Andre Lafortune
Status: Open, Priority: Normal
Category: lib, Target version: 1.9.2
ruby -v: ruby 1.9.2dev (2010-04-19 trunk 27394) [x86_64-darwin10.3.0] 

Set (& SortedSet) were forgotten when adding keep_if and select!

Unless there is objection, I'll commit the attached patch (and add tests to RubySpec).


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