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Implement a small REPL shell using rustyline.
It parses all the sources into a tree once, displaying a status bar as it goes along:
![image](https://user-images.githubusercontent.com/3423837/151529343-3a931747-5752-4f7a-ac52-bb46f9b96691.png)
Then you can query from a REPL, and it's actually a bit more responsive. The repl does minimal checks like bracket matching:
![image](https://user-images.githubusercontent.com/3423837/151529495-6dc43eea-4e53-4e4d-85ce-7f9bfef6505c.png)
Questions: