knu	2008-05-27 20:37:51 +0900 (Tue, 27 May 2008)

  New Revision: 16646

  Modified files:
    branches/ruby_1_8/NEWS

  Log:
    Add a note about Array#slice! changes.


  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/branches/ruby_1_8/NEWS?r1=16646&r2=16645&diff_format=u

Index: ruby_1_8/NEWS
===================================================================
--- ruby_1_8/NEWS	(revision 16645)
+++ ruby_1_8/NEWS	(revision 16646)
@@ -395,6 +395,37 @@
 
 === Compatibility issues (excluding feature bug fixes)
 
+* String#slice! had some unintentional bugs and they have been fixed
+  because either they disagreed with documentation or their respective
+  behavior of #slice.  Unfortunately, this causes some
+  incompatibilities in the following (somewhat rare) cases.
+
+  * #slice! no longer expands the array when an out-of-boundary value
+    is given.
+
+      # Ruby 1.8.6
+      a = [1,2]
+      a.slice!(4,0)   #=> nil
+      a               #=> [1,2,nil,nil]
+
+      # Ruby 1.8.7
+      a = [1,2]
+      a.slice!(4,0)   #=> nil
+      a               #=> [1,2]
+
+  * #slice! no longer raises an exception but returns nil when a
+    negative length or out-of-boundary negative position is given.
+
+      # Ruby 1.8.6
+      a = [1,2]
+      a.slice!(1,-1)  #=> (raises IndexError)
+      a.slice!(-5,1)  #=> (raises IndexError)
+
+      # Ruby 1.8.7
+      a = [1,2]
+      a.slice!(1,-1)  #=> nil
+      a.slice!(-5,1)  #=> nil
+
 * String#to_i, String#hex and String#oct no longer accept a sequence
   of underscores (`__') as part of a number.
 

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