rsmith accepted this revision.
rsmith added a reviewer: rsmith.
This revision is now accepted and ready to land.
================
Comment at: lib/Lex/PPMacroExpansion.cpp:1489-1492
@@ +1488,6 @@
+ // a diagnostic and a dummy value.
+ if (Result.hasValue())
+ OS << Result.getValue();
+ else {
+ OS << 0;
+ if (!SuppressDiagnostic)
----------------
I think this can be done without any changes to any `Op` implementation: each
of them already diagnoses a left paren just as it would diagnose any other
unexpected token. But the custom diagnostic also seems fine.
http://reviews.llvm.org/D17149
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