さっき通りましたね．path_readlink って readlink とは別なんでしたっけ？もしそうであれば Foundation で readlink しか使われていないからかもしれません． https://github.com/swiftlang/swift-foundation/blob/bc7c25794410715fc7c669ac6b99e0e1868e4510/Sources/FoundationEssentials/FileManager/FileManager%2BSymbolicLinks.swift#L204

swift-foundation/Sources/FoundationEssentials/FileManager/FileManag...

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