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================
Comment at: clang-tools-extra/clang-tidy/utils/HeaderFileExtensionsUtils.h:17
 
+using llvm::SmallSet;
+
----------------
Eugene.Zelenko wrote:
> It'll be easier to use llvm::SmallSet in using statement.
Unfortunately, that won't compile.

The reason is that the llvm checkers live in `namespace 
clang::clang-tidy::llvm`, so if you include an llvm checker header, which opens 
the `clang::clang-tidy::llvm` namespace, clang doesn't know whether to look in 
`llvm` or `clang::clang-tidy::llvm` since you are in `clang::clang-tidy`.

The error does suggest using `::llvm::SmallSet`, but that seems sorta klugey.

Since this looks ugly, how about I add `using llvm::SmallSet;` to ` 
clang/include/clang/LLVM.h`?



Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D59802/new/

https://reviews.llvm.org/D59802



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