Contract.Legacy_big_map_difftype item = private | Update of {big_map : Tezos_protocol_environment_020_PsParisC.Z.t;diff_key : Script.expr;diff_key_hash : Script_expr_hash.t;diff_value : Script.expr option;}| Clear of Tezos_protocol_environment_020_PsParisC.Z.t| Copy of {src : Tezos_protocol_environment_020_PsParisC.Z.t;dst : Tezos_protocol_environment_020_PsParisC.Z.t;}| Alloc of {big_map : Tezos_protocol_environment_020_PsParisC.Z.t;key_type : Script.expr;value_type : Script.expr;}type t = private item listval of_lazy_storage_diff : Lazy_storage.diffs -> t