DescribeEngineVersions (smaws-clients.Smaws_Client

val error_to_string : 
  [ Smaws_Lib.Protocols.AwsJson.error
  | `InvalidParameterCombinationException of
    Types.invalid_parameter_combination_exception
  | `InvalidParameterValueException of Types.invalid_parameter_value_exception
  | `ServiceLinkedRoleNotFoundFault of
    Types.service_linked_role_not_found_fault ] ->
  string

val request : 
  'http_type Smaws_Lib.Context.t ->
  Types.describe_engine_versions_request ->
  (Types.describe_engine_versions_response,
    [> Smaws_Lib.Protocols.AwsJson.error
    | `InvalidParameterCombinationException of
      Types.invalid_parameter_combination_exception
    | `InvalidParameterValueException of
      Types.invalid_parameter_value_exception
    | `ServiceLinkedRoleNotFoundFault of
      Types.service_linked_role_not_found_fault ])
    Stdlib.result

val request_with_metadata : 
  'http_type Smaws_Lib.Context.t ->
  Types.describe_engine_versions_request ->
  (Types.describe_engine_versions_response Smaws_Lib.Response.t,
    [> Smaws_Lib.Protocols.AwsJson.error
    | `InvalidParameterCombinationException of
      Types.invalid_parameter_combination_exception
    | `InvalidParameterValueException of
      Types.invalid_parameter_value_exception
    | `ServiceLinkedRoleNotFoundFault of
      Types.service_linked_role_not_found_fault ]
    * Smaws_Lib.Response.metadata)
    Stdlib.result