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Libc++ was incorrectly reporting an error when the target of create_directory already exists, but was not a directory. This behavior is not specified in the most recent standard, which says no error should be reported. Additionally, libc++ failed to report an error when the attribute directory path didn't exist or didn't name a directory. This has been fixed as well. Although it's not clear if we should call status or symlink_status on the attribute directory. This patch chooses to still call status. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@337888 91177308-0d34-0410-b5e6-96231b3b80d8