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diff --git a/src/Util/Unit.v b/src/Util/Unit.v
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+Require Import Coq.Classes.Morphisms.
+Require Import Relation_Definitions.
+
+(* an equivalence for a relation on trivial things, like [unit] *)
+Global Instance Equivalence_trivial {A} : Equivalence (fun _ _ : A => True).
+Proof.
+  repeat constructor.
+Qed.