proposition: Lemma naturality_local : naturality [the functor of Local.acto E \o M] [the functor of M] local.
proof: Proof. by move=> A B h; apply boolp.funext => -[]. Qed.
imports: JMeq mathcomp(all_ssreflect) mathcomp(finmap) mathcomp(classical_sets) monae_lib HB(structures) hierarchy monad_lib fail_lib state_lib trace_lib monad_transformer