[clang] [clang] assert fail when number of arguments in pack exceed implement… (PR #74220)

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cor3ntin wrote:

Thanks for this PR!
Emitting a diag in `TransformTemplateParmRefExpr` would probably a better way to go about it. It's not clear to me that the assert` is an improvement , and adding a diag would not be a lot more work. Would that be something you would be willing to explore?
 

https://github.com/llvm/llvm-project/pull/74220