benlangmuir added a comment.

I agree with not detecting these during PP-only, but there's nothing wrong with 
`<#>`.  It's either not a placeholder, or it's part of a placeholder like 
`<#>#>`, which is a placeholder containing the text ">".  Similarly, `<##` 
could be the start of an empty placeholder `<##>`.


Repository:
  rL LLVM

https://reviews.llvm.org/D34256



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