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+(* Exemple soumis par Pierre Corbineau (bug #1671) *)
+
+CoInductive hdlist : unit -> Type :=
+| cons : hdlist tt -> hdlist tt.
+
+Variable P : forall bo, hdlist bo -> Prop.
+Variable all : forall bo l, P bo l.
+
+Definition F (l:hdlist tt) : P tt l :=
+match l in hdlist u return P u l with
+| cons (cons l') => all tt _
+end.