ogoffart marked an inline comment as done.
ogoffart added inline comments.

================
Comment at: lib/Lex/PPExpressions.cpp:242
   switch (PeekTok.getKind()) {
-  default:  // Non-value token.
+  default:
+    // If this token's spelling is a pp-identifier, check to see if it is
----------------
rsmith wrote:
> I'm concerned that this will do the wrong thing for a keyword operator that 
> is not permitted in a pp expression, like and_eq. It seems safer to revert 
> this change and instead add a isCPlusPlusOperatorKeyword check to the "if" 
> condition above.
Well spotted.  I kept this code in the default:  so true and false are handled 
separatly, but added a condition for isCPlusPlusOperatorKeyword, and an 
additional test.


https://reviews.llvm.org/D35172



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