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In the added test case, the `typealias` refers to the `HiddenStruct` type in the private module, which is imported as `@_implementationOnly`. Because the import is `@_implementationOnly`, during deserialization, we don’t import the private module and hence any reference to the `HiddenStruct` type fails. In the common deserialization code path, this causes us to skip over the `typealias` member. However, when creating the protocol conformance, we assume that we can resolve the type to which the `typealias` refers and thus we are crashing. If `LangOpts.EnableDeserializationRecovery` is set to `true`, we should do our best to recover from such failures so this patch makes the deserialization failure handling more graceful and resolve the right-hand side of the `typealias` as an `ErrorType`. Fixes rdar://72891807
30 lines
1.0 KiB
Swift
30 lines
1.0 KiB
Swift
// RUN: %empty-directory(%t)
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//// Build the private module and the public module normally.
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//// Force the public module to be system with an underlying Clang module.
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// RUN: %target-swift-frontend -emit-module -DPRIVATE_LIB %s -module-name private_lib -emit-module-path %t/private_lib.swiftmodule
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// RUN: %target-swift-frontend -emit-module -DPUBLIC_LIB %s -module-name public_lib -emit-module-path %t/public_lib.swiftmodule -I %t -I %S/Inputs/protocol-requirement-in-implementation-only -import-underlying-module
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//// Printing the public module should not crash when reading the HiddenStruct typealias in `M`.
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// RUN: %target-swift-ide-test -print-module -module-to-print=public_lib -source-filename=x -skip-overrides -I %t
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#if PRIVATE_LIB
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public struct HiddenStruct {
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public init() {}
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}
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#elseif PUBLIC_LIB
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@_implementationOnly import private_lib
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protocol SomeProtocol {
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associatedtype Value
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static var defaultValue: Value { get }
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}
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public struct M: SomeProtocol {
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typealias Value = HiddenStruct
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static let defaultValue = HiddenStruct()
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}
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#endif
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