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In Xcode 16 SDKs there seem to be two `errno` visible for some files, one in the `Darwin` module, and one in the `_errno` module (which seems new for this Xcode version). Disambiguate the references by prepending `Darwin`, which should be the one that was being used before Xcode 16 SDKs.
The modules in the 'stdlib/private' directory contain APIs that are considered private to the Swift project. Don't use them outside of the repositories related to the Swift project. These APIs are used for building Swift build and test automation tools, represent early prototypes of APIs that are not intended to be included in the standard library soon, modules to support ports to other platforms, and other similar needs that are private to the Swift project and its development process.