[libcxx-commits] [libcxx] [libc++] Fix UB in filesystem::__copy for non-existent destination. (PR #87615)

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EricWF wrote:

> At first, I thought, that problem is in linux itself, but documentation states that `struct stat` state is undefined if `fstat/lstat/stat` returned "failure" indicator.

Which documentation are you referring to?

https://github.com/llvm/llvm-project/pull/87615