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(* A lift was missing in expanding aliases under binders for unification *)
(* Below, the lift was missing while expanding the reference to
[mkcons] in [?N] which was under binder [arg] *)
Goal forall T (t : T) (P P0 : T -> Set), option (option (list (P0 t)) -> option (list (P t))).
intros ????.
refine (Some
(fun rls
=> let mkcons := ?[M] in
let default arg := ?[N] in
match rls as rls (* 2 *) return option (list (P ?[O])) with
| Some _ => None
| None => None
end)).
Abort.
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