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That can be desirable but there are a few challenges:

- The compiler code becomes more complicated, making correctness harder

- The compiler might become slower to run

- Introducing new languages features may become harder, again due to code complexity

Compiler will get plenty complicated without IDE scenarios, trust me on that one. Slowness is also never really a thing to worry about here, especially because usage patterns in an IDE vs. a batch process are so different. It's almost always the other way around: someone writes something that's completely fine for a batch process but tanks IDE performance.

> The compiler code becomes more complicated, making correctness harder

> Introducing new languages features may become harder, again due to code complexity

It'll be written for IDEs anyway. Might as well reuse if possible, right?

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