[4.2] [Serialization] Drop extensions whose requirements are missing types #17526
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…wiftlang#17488) If, for whatever reason, a type used in an extension's generic requirements is missing, just drop the whole extension. This isn't wonderful recovery, but in practice nothing should be able to use the extension anyway, since the relevant type in question is missing. ...Okay, that's not quite true; there could, for example, be inlinable code that references one of these methods. However, that (1) isn't worse than the behavior for any other inlinable code (which doesn't yet attempt to recover from missing declarations), and (2) is still a strict improvement over the current situation, where we will eagerly abort the compiler trying to load the extension in the first place. rdar://problem/40956460 (cherry picked from commit 7f33f47)
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@swift-ci Please test |
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Cherry-pick of #17488 to the 4.2 branch. Reviewed by @slavapestov.
rdar://problem/40956460