DescribeDBInstances (smaws-clients.Smaws_Client

val error_to_string : 
  [ Smaws_Lib.Protocols.AwsQuery.error
  | `DBInstanceNotFoundFault of Types.db_instance_not_found_fault ] ->
  string

val request : 
  'http_type Smaws_Lib.Context.t ->
  Types.describe_db_instances_message ->
  (Types.db_instance_message,
    [> Smaws_Lib.Protocols.AwsQuery.error
    | `DBInstanceNotFoundFault of Types.db_instance_not_found_fault ])
    Stdlib.result

val request_with_metadata : 
  'http_type Smaws_Lib.Context.t ->
  Types.describe_db_instances_message ->
  (Types.db_instance_message Smaws_Lib.Response.t,
    [> Smaws_Lib.Protocols.AwsQuery.error
    | `DBInstanceNotFoundFault of Types.db_instance_not_found_fault ]
    * Smaws_Lib.Response.metadata)
    Stdlib.result