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Author SHA1 Message Date
Richard Smith cb1beee76f [c++20] Implement tweaked __VA_OPT__ rules from P1042R1: 
* __VA_OPT__ is expanded if the *expanded* __VA_ARGS__ is non-empty,
   not if the original argument contained no tokens.
 * Placemarkers at the start and end of __VA_OPT__ are retained just
   long enough to paste them with adjacent ## operators. We never paste
   "across" a discarded placemarker.

llvm-svn: 359964
 2019-05-04 06:46:18 +00:00