[libcxx-commits] [libcxx] [libcxx] Put `std::monostate` in `<utility>` (PR #128373)

[A. Jiang via libcxx-commits]

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+// -*- C++ -*-
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frederick-vs-ja wrote:

I think we can and should just include existing `<__variant/monostate.h>` in `<utility>`.

https://github.com/llvm/llvm-project/pull/128373