Sema: Add simulation of buggy Swift 3 typealias accessibility checking #6234
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Basically if the underlying type of a typealias was dependent on generic parameters from context, it wouldn't participate in accessibility checking. Turns out people were (accidentally) relying on this behavior, so add a simulation of it in Swift 3 mode by ignoring such typealiases entirely. Fixes <rdar://problem/29549232>.
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@swift-ci Please smoke test |
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Is it possible to produce warning when someone is depending on this in swift 3 mode? |
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Awesome, thanks @slavapestov ! |
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Basically if the underlying type of a typealias was dependent on
generic parameters from context, it wouldn't participate in
accessibility checking.
Turns out people were (accidentally) relying on this behavior, so
add a simulation of it in Swift 3 mode by ignoring such typealiases
entirely.
Fixes rdar://problem/29549232.