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As documented in the [SE-244 proposal](https://github.com/apple/swift-evolution/blob/main/proposals/0244-opaque-result-types.md#effect-on-api-resilience), it is illegal to change the concrete return type of an @inlinable function with an opaque return type. This ought to be documented since it is an extremely subtle rule that authors of ABI stable libraries should be aware of.
45 KiB
45 KiB