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Require Import ssreflect ssrbool ssrnat eqtype seq fintype zmodp.
Axiom P : forall T, seq T -> Prop.
Goal (forall T (s : seq T), P _ s).
move=> T s.
elim: s => [| x /lastP [| s] IH].
Admitted.
Goal forall x : 'I_1, x = 0 :> nat.
move=> /ord1 -> /=; exact: refl_equal.
Qed.
Goal forall x : 'I_1, x = 0 :> nat.
move=> x.
move=> /ord1 -> in x |- *.
exact: refl_equal.
Qed.
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