ilya-biryukov added a comment.

In https://reviews.llvm.org/D42966#1085303, @mikhail.ramalho wrote:

> Hi,
>
> > Where do virtual files come from in the first place?
>
> From the linemarker:


I tried dumping locations in presence of line markers.
They have non-null `FileEntry` and a reasonable offset, so the original code 
should work just fine in presence of line markers.
I don't see why changing to presumed locations fixes the issue with not 
generating the USRs.

Could you provide a minimal example where USRs are not generated? It might be 
the case that there are other ways to fix it.


Repository:
  rC Clang

https://reviews.llvm.org/D42966



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