const go.opentelemetry.io/otel/api/trace.currentSpanKey

3 uses

	go.opentelemetry.io/otel/api/trace (current package)
		context.go#L24: 	currentSpanKey traceContextKeyType = iota
		context.go#L31: 	return context.WithValue(ctx, currentSpanKey, span)
		context.go#L36: 	if span, has := ctx.Value(currentSpanKey).(Span); has {