Invalidate fastpath when calling attr_reader by super

The same bug as 8355a99883 existed in attr_reader too.

1 files changed, 28 insertions, 1 deletions

diff --git a/test/ruby/test_super.rb b/test/ruby/test_super.rb
index 7cbe851fdf..78c8ee5dc2 100644
--- a/test/ruby/test_super.rb
+++ b/test/ruby/test_super.rb
@@ -604,7 +604,7 @@ class TestSuper < Test::Unit::TestCase
     assert_equal :boo2, subklass.new.boo
   end
 
-  def test_super_attr_writer # Bug #16785
+  def test_super_attr_writer # [Bug #16785]
     writer_class = Class.new do
       attr_writer :test
     end
@@ -633,4 +633,31 @@ class TestSuper < Test::Unit::TestCase
     assert_equal 3, superwriter.instance_variable_get(:@test)
     assert_equal 4, inherited.instance_variable_get(:@test)
   end
+
+  def test_super_attr_reader
+    writer_class = Class.new do
+      attr_reader :test
+    end
+    superwriter_class = Class.new(writer_class) do
+      def initialize
+        @test = 1 # index: 1
+      end
+
+      def test
+        super
+      end
+    end
+    inherited_class = Class.new(superwriter_class) do
+      def initialize
+        @a = nil
+        @test = 2 # index: 2
+      end
+    end
+
+    superwriter = superwriter_class.new
+    assert_equal 1, superwriter.test # set ic->index of superwriter_class#test to 1
+
+    inherited = inherited_class.new
+    assert_equal 2, inherited.test # it may read index=1 while it should be index=2
+  end
 end