Tezos_validation.Patch_contextval patch_context :
Tezos_base.TzPervasives.Genesis.t ->
(string * Tezos_base.TzPervasives.Data_encoding.json) option ->
Tezos_context_ops.Context_ops.t ->
Tezos_context_ops.Context_ops.t Tezos_base.TzPervasives.tzresult Lwt.t