[libcxx-commits] [libcxx] Fix issue with never-constexpr __construct_at in C++ < 20. (PR #87403)

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EricWF wrote:

> FWIW the code change itself looks good to me. Do you have a reproducer that would be easy to commit as a test?

I do not. It appears to need both Clang modules and enough code to prevent inlining. I tried hard to find one.

https://github.com/llvm/llvm-project/pull/87403