Including an external file when debug in vscode

Is this a bug or something wrong?
![圖片](https://user-images.githubusercontent.com/7563962/93777322-31700280-fc57-11ea-8694-d35741660c0f.png)
![圖片](https://user-images.githubusercontent.com/7563962/93777367-4056b500-fc57-11ea-8dbd-a648a621be9e.png)
![圖片](https://user-images.githubusercontent.com/7563962/93777392-49478680-fc57-11ea-86b8-15f15238c7ac.png)

