[libcxx-commits] [libcxx] [libc++] LWG3260: year_month* arithmetic rejects durations convertible to years (PR #196384)

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Skyfrei wrote:

I added tests since I touched the operators directly but I suppose a compile only test could be sufficient too. Just decided to add arithmetic tests as well because of decaded incrementing and decremeting by 10. 

https://github.com/llvm/llvm-project/pull/196384