[6.0🍒] NCGenerics: introduce SuppressedAssociatedTypes #72812
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There no longer is a lit feature called `noncopyable_generics`, it's just always on now. (cherry picked from commit 554fa49)
The model for associated types hasn't been fully worked-out for noncopyable generics, but there is some support already that is being used by the stdlib for an internal-only (and rather cursed) protocol `_Pointer` to support `UnsafePointer`, etc. This patch gates the existing experimental support for associated types behind a feature flag. This flag doesn't emit feature-guards in interfaces, since support for it is tied closely to NoncopyableGenerics and has been there from its early days. (cherry picked from commit 3098353)
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DougGregor
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Apr 4, 2024
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6.0 cherry-pick #72786 and the test-only rider #72746.
~Copyableassociated types behind an experimental feature flag,SuppressedAssociatedTypes. The rationale is that they're not quite ready for prime-time and should be deferred from the current NoncopyableGenerics proposal / feature.Reviewed by: @DougGregor