ko1	2016-04-13 12:03:37 +0900 (Wed, 13 Apr 2016)

  New Revision: 54556

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=54556

  Log:
    * test/ruby/test_basicinstructions.rb: add a test to check access
      instance variables on special const objects.
    
      All of such objects are frozen, so that we can not set instance
      variables for them. But we can read instance variables and return
      default value (nil).

  Modified files:
    trunk/ChangeLog
    trunk/test/ruby/test_basicinstructions.rb
Index: test/ruby/test_basicinstructions.rb
===================================================================
--- test/ruby/test_basicinstructions.rb	(revision 54555)
+++ test/ruby/test_basicinstructions.rb	(revision 54556)
@@ -698,4 +698,26 @@ class TestBasicInstructions < Test::Unit https://github.com/ruby/ruby/blob/trunk/test/ruby/test_basicinstructions.rb#L698
     assert_equal [], [*a]
     assert_equal [1], [1, *a]
   end
+
+  def test_special_const_instance_variables
+    assert_separately(%w(-W0), <<-INPUT, timeout: 60)
+    module M
+      def get
+        # we can not set instance variables on special const objects.
+        # However, we can access instance variables with default value (nil).
+        @ivar
+      end
+    end
+    class Fixnum; include M; end
+    class Float; include M; end
+    class Symbol; include M; end
+    class FalseClass; include M; end
+    class TrueClass; include M; end
+    class NilClass; include M; end
+
+    [123, 1.2, :sym, false, true, nil].each{|obj|
+      assert_equal(nil, obj.get)
+    }
+    INPUT
+  end
 end
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 54555)
+++ ChangeLog	(revision 54556)
@@ -1,3 +1,12 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Wed Apr 13 12:00:08 2016  Koichi Sasada  <ko1@a...>
+
+	* test/ruby/test_basicinstructions.rb: add a test to check access
+	  instance variables on special const objects.
+
+	  All of such objects are frozen, so that we can not set instance
+	  variables for them. But we can read instance variables and return
+	  default value (nil).
+
 Tue Apr 12 20:40:35 2016  Kaneko Yuichiro  <spiketeika@g...>
 
 	* ext/date/date_core.c (time_to_time): should preserve timezone

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