proposition: Lemma eqb_refl {A} `{E:Eq A} (a : A) : eqb a a = true.
proof: Proof. destruct (eqb_spec a a); intuition. Qed.
imports: Equations(Equations) Examples.Fin Relations Utf8 Relations Wellfounded Setoid RelationClasses Morphisms Lia Bool List Arith String Coq(FunctionalExtensionality) ssreflect