test_assignment.rb: assignment to private attribute

* test/ruby/test_assignment.rb (test_assign_private_self): test
  for r3509, assignment to private attribute is allowed iff its
  receiver is literal `self`.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46364 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_assignment.rb

@@ -101,6 +101,29 @@ def test_assign_abbreviated
     assert_equal([1, 2, 3, [1, 2, 3]], a[:x], bug2050)
   end
 
+  def test_assign_private_self
+    o = Object.new
+    class << o
+      private
+      def foo=(a); 42; end
+      def []=(i, a); 42; end
+    end
+
+    assert_raise(NoMethodError) {
+      o.instance_eval {o.foo = 1}
+    }
+    assert_nothing_raised(NoMethodError) {
+      assert_equal(1, o.instance_eval {self.foo = 1})
+    }
+
+    assert_raise(NoMethodError) {
+      o.instance_eval {o[0] = 1}
+    }
+    assert_nothing_raised(NoMethodError) {
+      assert_equal(1, o.instance_eval {self[0] = 1})
+    }
+  end
+
   def test_yield
     def f; yield(nil); end; f {|a| assert_nil(a)}; undef f
     def f; yield(1); end; f {|a| assert_equal(1, a)}; undef f