proposition: Lemma naturality_abort : naturality [the functor of ContOpsAbort.acto r \o M] [the monad of M] abort.
proof: Proof. by []. Qed.
imports: mathcomp(all_ssreflect) imonae_lib HB(structures) ihierarchy imonad_lib ifail_lib istate_lib itrace_lib imonad_transformer