[5.9] Sema: Ban unavailable deinits #64844
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Destructors are always called if declared, so allowing deinit to be declared as
unavailable (or potentially unavailable) creates a type checking loophole that
allows unavailable code to execute at runtime:
```
class C {
@available(*, unavailable)
deinit {
print("Oops")
}
}
_ = C() // prints "Oops"
```
Resolves rdar://106409012 and swiftlang#63854.
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@swift-ci please test |
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@swift-ci please test source compatibility |
nkcsgexi
approved these changes
Apr 2, 2023
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Cherry pick of #64843
Destructors are always called if declared, so allowing deinit to be declared as unavailable (or potentially unavailable) creates a type checking loophole that allows unavailable code to execute at runtime:
Resolves rdar://106409012 and #63854.