File: bug_4016.v

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Require Import Setoid.

Parameter eq : relation nat.
#[export] Declare Instance Equivalence_eq : Equivalence eq.

Lemma foo : forall z, eq z 0 -> forall x, eq x 0 -> eq z x.
Proof.
intros z Hz x Hx.
rewrite <- Hx in Hz.
destruct z.
Abort.