ldionne added a comment.

I'm not entirely sure I understand the purpose of this patch. So the idea is 
that let's say a tool suggests including `<__algorithm/find.h>` to get the 
definition of `std::find` as a IWYU fix-it sort of suggestion, the user would 
naively do that, and then the compiler (with this patch) would error out saying 
"woops, you can't include that libc++ detail header". Is that the idea?
If that's it, then I would much rather fix the tools that incorrectly suggest 
including those implementation detail headers in the first place. Users will be 
less confused and we won't have to special-case a special directory name, which 
I can imagine could cause issues. I think it's great to try and give the proper 
diagnostic to users, but I think the correct place to do that is in the tool 
that suggests it in the first place. Thoughts?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D105439/new/

https://reviews.llvm.org/D105439

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