Mark image attachments as unavailable on non-Darwin/non-Windows. #1330
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…n and Windows. This PR eliminates a bunch of duplicated code between Darwin and Windows that's used to support image attachments. We're able to do this because `_AttachableImageWrapper` is now a class and can be included in conforms-to generic constraints, so we can write `where AttachableValue: _AttachableImageWrapper<T> & AttachableWrapper`. It was previously a structure and structures can't be used in generic constraints this way. There's a new public, underscored protocol introduced here, `_AttachableAsImage`, that serves as a "base" protocol for `AttachableAsCGImage` and `AttachableAsIWICBitmapSource`. I intend to promote this protocol to API, but it will need a Swift Evolution proposal first. I'm going to include it in a future "image attachments refinement" proposal that will cover a few other things.
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This PR explicitly marks the image attachments API bits in the core Swift Testing library as unavailable on e.g. Linux. Developers who attempt to use this API on Linux will get diagnostics such as: > 🛑 'AttachableImageFormat' is unavailable: Image attachments are not available on this platform.
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This PR explicitly marks the image attachments API bits in the core Swift Testing library as unavailable on e.g. Linux. Developers who attempt to use this API on Linux will get diagnostics such as:
Blocked on #1329.
Checklist: