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

[Kristina Brooks via Phabricator via cfe-commits]

kristina added inline comments.


================
Comment at: lib/Lex/PPDirectives.cpp:1892
       if (!File) {
-        while (!isAlphanumeric(Filename.front())) {
+        while (!Filename.empty() && !isAlphanumeric(Filename.front())) {
           Filename = Filename.drop_front();
----------------
This line is tripping the assert, it seems best course of action would be a single check here and then just diagnosing an error unless you have managed to find other cases, in which case all the checks below are also warranted.


Repository:
  rC Clang

https://reviews.llvm.org/D52721