Import.JsonSourceval read_json_params :
(Linol_jsonrpc__Jsonrpc.Json.t -> 'a) ->
Linol_jsonrpc.Jsonrpc.Structured.t ->
('a, string) resultval message_params :
Linol_jsonrpc.Jsonrpc.Structured.t option ->
(Linol_jsonrpc__Jsonrpc.Json.t -> 'a) ->
('a, string) result