Add ML Reference and a test for r30736 [ruby-core:34997]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30738 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -4,7 +4,7 @@ Mon Jan 31 04:45:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 	  rb_resize_capa because rb_resize_capa expects resized length is
 	  smaller than current array length. call rb_ary_unshare before
 	  rb_resize_capa because rb_resize_capa losts the reference to
-	  original shared array.
+	  original shared array. [ruby-core:34997]
 
 Sun Jan 30 17:19:46 2011  Tanaka Akira  <akr@fsij.org>
 

test/ruby/test_array.rb

@@ -1456,6 +1456,12 @@ class TestArray < Test::Unit::TestCase
     assert_raise(ArgumentError) { a.uniq!(1) }
     assert_raise(ArgumentError) { f.uniq!(1) }
     assert_raise(RuntimeError) { f.uniq! }
+
+    assert_nothing_raised do
+      a = [ {c: "b"}, {c: "r"}, {c: "w"}, {c: "g"}, {c: "g"} ]
+      a.sort_by!{|e| e[:c]}
+      a.uniq!   {|e| e[:c]}
+    end
   end
 
   def test_uniq_bang_with_block