nobu	2017-09-02 10:08:27 +0900 (Sat, 02 Sep 2017)

  New Revision: 59719

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59719

  Log:
    Update Hash#compact! documentation [ci skip]
    
    * hash.c (rb_hash_compact_bang): [DOC] update the case if no
      changes were made.  [ruby-core:82591] [Bug #13855] [Fix GH-1692]
    
    Author:    Lucas Buchala <lucasbuchala@g...>

  Modified files:
    trunk/hash.c
Index: hash.c
===================================================================
--- hash.c	(revision 59718)
+++ hash.c	(revision 59719)
@@ -2819,10 +2819,10 @@ rb_hash_compact(VALUE hash) https://github.com/ruby/ruby/blob/trunk/hash.c#L2819
 
 /*
  *  call-seq:
- *     hsh.compact! -> hsh
+ *     hsh.compact! -> hsh or nil
  *
  *  Removes all nil values from the hash.
- *  Returns the hash.
+ *  Returns nil if no changes were made, otherwise returns the hash.
  *
  *     h = { a: 1, b: false, c: nil }
  *     h.compact!     #=> { a: 1, b: false }

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