proposition: Lemma nil_context : forall t v1 v2, List.In (vars v1 v2) nil -> @related t v1 v2.
proof: Proof. simpl; tauto. Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.ZArith.ZArith Coq.Classes.Morphisms Fiat.Parsers.Reflective.Syntax Fiat.Parsers.Reflective.Semantics Fiat.Parsers.Reflective.PartialUnfold Fiat.Parsers.Reflective.SyntaxEquivalence Fiat.Parsers.Reflective.Morphisms Fiat.Common.List.ListFacts Fiat.Common.Equality