code: func (c *Redshift) DeleteClusterSubnetGroup(input *DeleteClusterSubnetGroupInput) (*DeleteClusterSubnetGroupOutput, error) {
  	req, out := c.DeleteClusterSubnetGroupRequest(input)
  	return out, req.Send()
  }
docs: // DeleteClusterSubnetGroup API operation for Amazon Redshift.
  //
  // Deletes the specified cluster subnet group.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for Amazon Redshift's
  // API operation DeleteClusterSubnetGroup for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidClusterSubnetGroupStateFault "InvalidClusterSubnetGroupStateFault"
  //   The cluster subnet group cannot be deleted because it is in use.
  //
  //   * ErrCodeInvalidClusterSubnetStateFault "InvalidClusterSubnetStateFault"
  //   The state of the subnet is invalid.
  //
  //   * ErrCodeClusterSubnetGroupNotFoundFault "ClusterSubnetGroupNotFoundFault"
  //   The cluster subnet group name does not refer to an existing cluster subnet
  //   group.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/DeleteClusterSubnetGroup