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+Require Import Setoid.
+
+Definition segv : forall x, (x = 0%nat) -> (forall (y : nat), (y < x)%nat -> nat) = forall (y : nat), (y < 0)%nat -> nat.
+intros x eq.
+assert (H : forall y, (y < x)%nat = (y < 0)%nat).
+rewrite -> eq. auto.
+Set Typeclasses Debug.
+Fail setoid_rewrite <- H. (* The command has indeed failed with message:
+=> Stack overflow. *)