+
+(* This test needs to parse "uno" in the context of the hypothesis H,
+ not in the context of the goal. *)
+alias id "O" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1/1)".
+theorem t: let uno \def S O in uno + uno = S uno \to uno=uno.
+ intros. unfold uno in H.
+ reflexivity.
+qed.