[clang] [clang] diagnose invalid std::tuple_size sizes (PR #159677)

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

@tbaederr @mizvekov Is the plan for Tim's patch to be backported and for this one to be in 22? This would make sense.
I reported a core issue here https://cplusplus.github.io/CWG/issues/3071.html

https://github.com/llvm/llvm-project/pull/159677