[libcxx-commits] [libcxx] [libc++][vector] include formatter only in C++23 (PR #112675)

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zmodem wrote:

There was some discussion of this in https://reviews.llvm.org/D149543 with @mordante 

I'm not familiar with the standard's requirements, but if they're only needed only in C++23, making the includes conditional sounds like a good option.

https://github.com/llvm/llvm-project/pull/112675