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diff --git a/html-test/src/Bug7.hs b/html-test/src/Bug7.hs
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+-- | This module caused a duplicate instance in the documentation for the Foo
+-- type.
+module Bug7  where
+
+-- | The Foo datatype
+data Foo = Foo
+
+-- | The Bar class
+class Bar x y
+
+-- | Just one instance
+instance Bar Foo Foo