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// RUN: %target-swift-frontend -emit-sil -verify %s
// https://github.com/apple/swift/issues/58149
// Crash while compiling Swift for TensorFlow
//
// This was caused by a bug in GenericSignatureBuilder, similar to one involving
// `CaseIterable`. In this reproducer, `KeyPathIterable` is similar enough to
// `CaseIterable` to have caused the GSB to crash. It was fixed by
// RequirementMachine abstract signatures.
import _Differentiation
@_spi(Reflection) import Swift
struct RNNCellInput<Input>: Differentiable {}
struct RNNCellOutput<Output>: Differentiable {}
protocol Layer: Differentiable {
associatedtype Input
associatedtype Output: Differentiable
@differentiable(reverse)
func callAsFunction(_ input: Input) -> Output
}
public protocol KeyPathIterable {
associatedtype AllKeyPaths: Sequence
where AllKeyPaths.Element == PartialKeyPath<Self>
}
protocol RecurrentLayerCell: Layer, KeyPathIterable
where
Input == RNNCellInput<TimeStepInput>,
Output == RNNCellOutput<TimeStepOutput>
{
associatedtype TimeStepInput
associatedtype TimeStepOutput: Differentiable
}
struct RecurrentLayer<Cell: RecurrentLayerCell>: Layer {
typealias Input = Cell.TimeStepInput
typealias Output = Cell.TimeStepOutput
var cell: Cell
@differentiable(reverse)
func callAsFunction(_ inputs: Cell.TimeStepInput) -> Cell.TimeStepOutput {
// expected-warning @+1 {{function call causes an infinite recursion}}
return self(inputs)
}
}
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