Section UseFinTuple.
Variables (n : nat) (T : finType).
(* tuple_finMixin could, in principle, be made Canonical to allow for folding *)
(* Finite.enum of a finite tuple type (see comments around eqE in eqtype.v),  *)
(* but in practice it will not work because the mixin_enum projector          *)
(* has been buried under an opaque alias, to avoid some performance issues    *)
(* during type inference.                                                     *)
Definition tuple_finMixin := Eval hnf in FinMixin (@FinTuple.enumP n T).
Canonical tuple_finType := Eval hnf in FinType (n.-tuple T) tuple_finMixin.
Canonical tuple_subFinType := Eval hnf in [subFinType of n.-tuple T].

Lemma card_tuple : #|{:n.-tuple T}| = #|T| ^ n.