cor3ntin added a comment.

This does not appear to be valid under MSVC and I don't think we should support 
features that MS does not (Nor can i find any documentation that it ought to 
work)
https://godbolt.org/z/7Te3YYeb9

Supporting the same concatenation behavior MSVC does have seem like a cleaner 
approach. We would not have an many new tokens.
Before you do anything though. I'd like the feedback of more folks.

I can't find any documentation for LPREFIX, but it seems in the general case, 
it can be emulated that way https://godbolt.org/z/dr7MjMs99

In terms of breaking change, it's only an issue if L/u/etc are existing macro 
at the point of use.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157747/new/

https://reviews.llvm.org/D157747

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