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

3 uses

	go.opentelemetry.io/otel/api/trace (current package)
		span_context.go#L75: var nilSpanID SpanID
		span_context.go#L76: var _ json.Marshaler = nilSpanID
		span_context.go#L81: 	return !bytes.Equal(s[:], nilSpanID[:])