[5.0] Restore a very narrow function argument conversion for -swift-version 4. #14481
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Allow functions with type `(()) -> T` to be passed in places where we expect `() -> T`, but only for -swift-version 4 (for -swift-version 3 this already works due to other horrible things in CSSimplify.cpp). We need to look at how we can help migrate these cases to -swift-version 5, but in the meantime, but that is something we can consider separately. Fixes rdar://problem/36670720 / https://bugs.swift.org/browse/SR-6796 (cherry picked from commit 6310aca)
Move the existing test into Compatibility/tuple_arguments_4.swift. Move the Swift 3 test, Compatibility/tuple_arguments.swift, into Compatibility/tuple_arguments_4.swift. Add a couple new tests to each file to capture what we do in each mode. Overall this doesn't seem like the most satisfying approach for covering compatibility testing in our standard commit testing, but it's all we've got at the moment. (cherry picked from commit 5a02541)
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@swift-ci Please smoke test and merge |
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Allow functions with type
(()) -> Tto be passed in places where weexpect
() -> T, but only for -swift-version 4 (for -swift-version 3this already works due to other horrible things in CSSimplify.cpp).
We need to look at how we can help migrate these cases to
-swift-version 5, but in the meantime, but that is something we can
consider separately.
Fixes rdar://problem/36670720 / https://bugs.swift.org/browse/SR-6796
(cherry picked from commit 6310aca)