* lib/set.rb (Set#intersect?, Set#disjoint?): Add new methods for
testing if two sets have any element in common.
[ruby-core:45641] [Feature #6588] Based on the code by marcandre.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42253 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
utilizing super returning self, and add tests while at it.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41022 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Set#keep_if more space and time efficient by avoiding to_a.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40819 b2dd03c8-39d4-4d8f-98ff-823fe69b080e