An internal Apple kernel debug kit suggests Apple has tested a MacBook with the A15 chip, alongside a separate A18 Pro-based MacBook that appears to be closer to a shippable product.

The information comes from internal kernel debug kit files used by Apple engineers. The kit was accidentally released on Apple’s website earlier this year, but it was quickly pulled after information started leaking out of it.
Within the Mac-related entries, there is a line that explicitly describes an unreleased MacBook…

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