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+
+(** Bug 4709 https://coq.inria.fr/bug/4709
+    Extraction wasn't reducing primitive projections in types. *)
+
+Require Extraction.
+
+Set Primitive Projections.
+
+Record t := Foo { foo : Type }.
+Definition ty := foo (Foo nat).
+
+(* Without proper reduction of primitive projections in
+   [extract_type], the type [ty] was extracted as [Tunknown].
+   Let's check it isn't the case anymore. *)
+
+Parameter check : nat.
+Extract Constant check => "(O:ty)".
+Extraction TestCompile ty check.