[PATCH] D52721: [Preprocessor] Fix a crash when handling non-alpha include header.

[Kristina Brooks via Phabricator via cfe-commits]

kristina added a reviewer: kristina.
kristina added a comment.

Able to reproduce easily:

  clang-8: /SourceCache/llvm-trunk-8.0/include/llvm/ADT/StringRef.h:143: char llvm::StringRef::front() const: Assertion `!empty()' failed.

Will try it with patches applied in a moment.


Repository:
  rC Clang

https://reviews.llvm.org/D52721