var go.opentelemetry.io/otel/trace.nilSpanID

3 uses

	go.opentelemetry.io/otel/trace (current package)
		trace.go#L91: 	nilSpanID SpanID
		trace.go#L92: 	_         json.Marshaler = nilSpanID
		trace.go#L98: 	return s != nilSpanID