knu	2017-10-22 02:03:40 +0900 (Sun, 22 Oct 2017)

  New Revision: 60317

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60317

  Log:
    Avoid use of `self.class.new(self)` in Set#collect!
    
    That prevents infinite recursion when a subclass of Set uses
    `collect!` in its constructor.
    
    This should fix [Bug #12437].

  Modified files:
    trunk/lib/set.rb
Index: lib/set.rb
===================================================================
--- lib/set.rb	(revision 60316)
+++ lib/set.rb	(revision 60317)
@@ -378,7 +378,9 @@ class Set https://github.com/ruby/ruby/blob/trunk/lib/set.rb#L378
   # Returns an enumerator if no block is given.
   def collect!
     block_given? or return enum_for(__method__) { size }
-    replace(self.class.new(self) { |o| yield(o) })
+    set = self.class.new
+    each { |o| set << yield(o) }
+    replace(set)
   end
   alias map! collect!
 

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