client.go
func OptClientTracer(tracer opentracing.Tracer) ClientOption {
	return func(options *ClientOptions) error {
		options.tracer = tracer
		return nil
	}
}
func OptClientTracer(tracer opentracing.Tracer) ClientOption {
	return func(options *ClientOptions) error {
		options.tracer = tracer
		return nil
	}
}
func OptClientTracer ( tracer opentracing . Tracer ) ClientOption { return func ( options * ClientOptions ) error { options . tracer = tracer return nil } }
// OptClientTracer sets the Open Tracing tracer
// See: https://opentracing.io
OptClientTracer sets the Open Tracing tracer See : https : // opentracing . io