rnk added inline comments.

================
Comment at: lib/Parse/ParseExprCXX.cpp:73-75
   PP.EnterToken(ColonToken);
   if (!AtDigraph)
     PP.EnterToken(DigraphToken);
----------------
rsmith wrote:
> This seems to mess up the cached token buffer in the same way; it's a little 
> surprising we don't see problems here too.
Fuzzing shows that there are more ways to trigger this assertion, so whether we 
keep this recovery mode or not, we might want to implement that token rewrite 
functionality.


https://reviews.llvm.org/D25882



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