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Consider: 1. File struct.swift defining `struct Struct` with `static func max` member 2. File derivatives.swift defining `extension Struct` with custom derivative of the `max` function 3. File error.swift defining a differentiable function which uses `Struct.max`. Previously, when passing error.swift as primary file and derivatives.swift as a secondary file to swift-frontend (and forgetting to pass struct.swift as a secondary file as well), an assertion failure was triggered. This patch fixes the issue by adding a check against `ErrorType` in `findAutoDiffOriginalFunctionDecl` before calling `lookupMember`. Co-authored-by: Anton Korobeynikov <anton@korobeynikov.info>
9 lines
378 B
Swift
9 lines
378 B
Swift
// RUN: %target-swift-frontend -emit-sil -verify -primary-file %s %S/Inputs/derivatives-error.swift -module-name main -o /dev/null
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import _Differentiation
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@differentiable(reverse)
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func clamp(_ value: Double, _ lowerBound: Double, _ upperBound: Double) -> Double {
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return Struct.max(min(value, upperBound), lowerBound) // expected-error {{cannot find 'Struct' in scope}}
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}
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