[clang] [clang-tools-extra] [Clang][C++29] Template pack indexing (PR #218738)

[Erich Keane via cfe-commits]

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@@ -540,7 +540,10 @@ bool RecursiveASTVisitor<Derived>::TraverseTypeConstraint(
     TRY_TO(TraverseConceptReference(C->getConceptReference()));
     return true;
   }
-  if (Expr *IDC = C->getImmediatelyDeclaredConstraint()) {
+  // A concept named through a template template parameter has no
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erichkeane wrote:

This doesn't seem like a generally useful comment, can you clarify here?  TBH it isn't really clear what is happening in the 'if' below anyway, so a clarifying comment is welcome.  But this doesn't seem to be very clarifying.

https://github.com/llvm/llvm-project/pull/218738