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N4100 states that an error shall be reported if `!exists(p) || !is_directory(p)`. We were missing the first half of the conditional. Invert the error and normal code paths to make the code easier to follow. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294127 91177308-0d34-0410-b5e6-96231b3b80d8