File: bug_4717.v

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(* Omega being smarter on recognizing nat and Z *)

From Stdlib Require Import Lia ZArith.

Definition nat' := nat.

Theorem le_not_eq_lt : forall (n m:nat),
    n <= m ->
    n <> m :> nat' ->
    n < m.
Proof.
  intros.
  lia.
Qed.

Goal forall (x n : nat'), x = x + n - n.
Proof.
  intros.
  lia.
Qed.

Open Scope Z_scope.

Definition Z' := Z.

Theorem Zle_not_eq_lt : forall n m,
    n <= m ->
    n <> m :> Z' ->
    n < m.
Proof.
  intros.
  lia.
Qed.