var google.golang.org/grpc/health.producerBuilderSingleton

3 uses

	google.golang.org/grpc/health (current package)
		producer.go#L34: 	producerBuilderSingleton = &producerBuilder{}
		producer.go#L40: var producerBuilderSingleton *producerBuilder
		producer.go#L67: 	pr, closeFn := sc.GetOrBuildProducer(producerBuilderSingleton)