steakhal added a comment.

In D93223#2553053 <https://reviews.llvm.org/D93223#2553053>, @Szelethus wrote:

> My no1. thought is that I wish the new functionality you're implementing was 
> in the interface of the `Preprocessor`. I found, and still find it so hard to 
> believe that you couldn't just retrieve this information

It is hard to believe, but it is the case.

> your projects seems to plug this gaping hole in the design.

I honestly think that it is the supposed way of doing this. The chained 
preprocessor callbacks and the token watcher fit perfectly into this picture.

> I respect that this is an opt-in functionality for now though, and I guess we 
> could make this a default feature with relative ease.

We should carefully evaluate the impact and stability of this before making it 
happen.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D93223/new/

https://reviews.llvm.org/D93223

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