[libcxx-commits] [libcxx] [libc++] Fix ambiguity in ranges::advance and ranges::next affecting flat_set (PR #177773)

[A. Jiang via libcxx-commits]

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frederick-vs-ja wrote:

I think we should move the contents to `libcxx/test/std/containers/container.adaptors/flat.set/flat.set.cons/initializer_list.pass.cpp` and actually run the new case.

https://github.com/llvm/llvm-project/pull/177773