[libcxx-commits] [libcxx] [libc++] fixing missing forward declarations of uses_allocator_construction_args (PR #67044)

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https://github.com/philnik777 requested changes to this pull request.

This looks to me like we're adding a lot more forward declarations than tests, which makes me suspect that this is fixing bugs which we don't add regression tests for. Please make sure we test all the overloads (especially differently qualified pair overloads).

https://github.com/llvm/llvm-project/pull/67044