usa	2012-12-25 19:45:20 +0900 (Tue, 25 Dec 2012)

  New Revision: 38596

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=38596

  Log:
    * ChangeLog: revert a part of r38595.  'iff' means 'if and only if', not typo.

  Modified files:
    trunk/thread.c

Index: thread.c
===================================================================
--- thread.c	(revision 38595)
+++ thread.c	(revision 38596)
@@ -4599,7 +4599,7 @@ recursive_list_access(void) https://github.com/ruby/ruby/blob/trunk/thread.c#L4599
 }
 
 /*
- * Returns Qtrue if obj_id (or the pair <obj, paired_obj>) is already
+ * Returns Qtrue iff obj_id (or the pair <obj, paired_obj>) is already
  * in the recursion list.
  * Assumes the recursion list is valid.
  */

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