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a52fac4470
In some circumstances, a Swift declaration in module A will depend on another declaration (usually from Objective-C) that can't be loaded, for whatever reason. If the Swift declaration is *overriding* the missing declaration, this can present a problem, because the way methods are dispatched in Swift can depend on knowing the original class that introduced the method. However, if the compiler can prove that the override can still be safely invoked/used in all cases, it doesn't need to worry about the overridden declaration being missing. This is especially relevant for property accessors, because there's currently no logic to recover from a property being successfully deserialized and then finding out that an accessor couldn't be. The decision of whether or not an override can be safely invoked without knowledge of the base method is something to be cautious about---a mistaken analysis would effectively be a miscompile. So up until now, this was limited to one case: when a method is known to be `@objc dynamic`, i.e. always dispatched through objc_msgSend. (Even this may become questionable if we have first-class method references, like we do for key paths.) This worked particularly well because the compiler infers 'dynamic' for any overload of an imported Objective-C method or accessor, in case it imports differently in a different -swift-version and a client ends up subclassing it. However...that inference does not apply if the class is final, because then there are no subclasses to worry about. This commit changes the test to be more careful: if the /missing/ declaration was `@objc dynamic`, we know that it can't affect ABI, because either the override is properly `@objc dynamic` as well, or the override has introduced its own calling ABI (in practice, a direct call for final methods) that doesn't depend on the superclass. Again, this isn't 100% correct in the presence of first-class methods, but it does fix the issue in practice where a property accessor in a parent class goes missing. And since Objective-C allows adding property setters separately from the original property declaration, that's something that can happen even under normal circumstances. Sadly. This approach could probably be extended to constructors as well. I'm a little more cautious about throwing vars and subscripts into the mix because of the presence of key paths, which do allow identity-based comparison of overrides and bases. rdar://problem/56388950
396 lines
15 KiB
Swift
396 lines
15 KiB
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend -emit-module -o %t -module-name Lib -I %S/Inputs/custom-modules %s
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// RUN: %target-swift-ide-test -source-filename=x -print-module -module-to-print Lib -I %t -I %S/Inputs/custom-modules | %FileCheck %s
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// RUN: %target-swift-ide-test -source-filename=x -print-module -module-to-print Lib -I %t -I %S/Inputs/custom-modules -Xcc -DBAD | %FileCheck -check-prefix CHECK-RECOVERY %s
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// RUN: %target-swift-frontend -typecheck %s -I %t -I %S/Inputs/custom-modules -Xcc -DBAD -D TEST -verify
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// REQUIRES: objc_interop
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#if TEST
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import Lib
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func testInitializers() {
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_ = D1_DesignatedInitDisappears()
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_ = D1_DesignatedInitDisappears(value: 0) // expected-error {{incorrect argument label in call}}
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_ = D1_DesignatedInitDisappears(convenience: 0)
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_ = D2_OnlyDesignatedInitDisappears(value: 0) // expected-error {{cannot be constructed because it has no accessible initializers}}
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_ = D2_OnlyDesignatedInitDisappears(convenience: 0) // expected-error {{cannot be constructed because it has no accessible initializers}}
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_ = D3_ConvenienceInitDisappears()
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_ = D3_ConvenienceInitDisappears(value: 0) // expected-error {{incorrect argument label in call}}
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_ = D3_ConvenienceInitDisappears(convenience: 0)
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_ = D4_UnknownInitDisappears()
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_ = D4_UnknownInitDisappears(value: 0) // expected-error {{argument passed to call that takes no arguments}}
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// FIXME: Why does 'init()' show up in the generated interface if it can't be
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// called?
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_ = D5_OnlyUnknownInitDisappears() // expected-error {{cannot be constructed because it has no accessible initializers}}
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_ = D5_OnlyUnknownInitDisappears(value: 0) // expected-error {{cannot be constructed because it has no accessible initializers}}
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}
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func testSubclassInitializers() {
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class DesignatedInitDisappearsSub : D1_DesignatedInitDisappears {}
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_ = DesignatedInitDisappearsSub()
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_ = DesignatedInitDisappearsSub(value: 0) // expected-error {{argument passed to call that takes no arguments}}
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_ = DesignatedInitDisappearsSub(convenience: 0) // expected-error {{argument passed to call that takes no arguments}}
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class OnlyDesignatedInitDisappearsSub : D2_OnlyDesignatedInitDisappears {}
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_ = OnlyDesignatedInitDisappearsSub(value: 0) // expected-error {{cannot be constructed because it has no accessible initializers}}
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_ = OnlyDesignatedInitDisappearsSub(convenience: 0) // expected-error {{cannot be constructed because it has no accessible initializers}}
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class ConvenienceInitDisappearsSub : D3_ConvenienceInitDisappears {}
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_ = ConvenienceInitDisappearsSub()
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_ = ConvenienceInitDisappearsSub(value: 0) // expected-error {{incorrect argument label in call}}
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_ = ConvenienceInitDisappearsSub(convenience: 0) // still inheritable
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class UnknownInitDisappearsSub : D4_UnknownInitDisappears {}
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_ = UnknownInitDisappearsSub()
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_ = UnknownInitDisappearsSub(value: 0) // expected-error {{argument passed to call that takes no arguments}}
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class OnlyUnknownInitDisappearsSub : D5_OnlyUnknownInitDisappears {}
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_ = OnlyUnknownInitDisappearsSub() // expected-error {{cannot be constructed because it has no accessible initializers}}
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_ = OnlyUnknownInitDisappearsSub(value: 0) // expected-error {{cannot be constructed because it has no accessible initializers}}
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}
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#else // TEST
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import Overrides
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// Please use prefixes to keep the printed parts of this file in alphabetical
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// order.
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public class SwiftOnlyClass {}
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public class A_Sub: Base {
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public override func disappearingMethod() {}
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public override func nullabilityChangeMethod() -> Any? { return nil }
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public override func typeChangeMethod() -> Any { return self }
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public override func disappearingMethodWithOverload() {}
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public override var disappearingProperty: Int { return 0 }
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public override var disappearingPropertySetter: Int {
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get { return 0 }
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set {}
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}
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}
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public class A_Sub2: A_Sub {
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public override func disappearingMethod() {}
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}
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public final class A_Sub3Final: Base {
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public override func disappearingMethod() {}
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public override func nullabilityChangeMethod() -> Any? { return nil }
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public override func typeChangeMethod() -> Any { return self }
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public override func disappearingMethodWithOverload() {}
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public override var disappearingProperty: Int { return 0 }
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public override var disappearingPropertySetter: Int {
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get { return 0 }
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set {}
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}
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}
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// CHECK-LABEL: class A_Sub : Base {
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// CHECK-NEXT: func disappearingMethod()
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// CHECK-NEXT: func nullabilityChangeMethod() -> Any?
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// CHECK-NEXT: func typeChangeMethod() -> Any
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// CHECK-NEXT: func disappearingMethodWithOverload()
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// CHECK-NEXT: var disappearingProperty: Int { get }
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// CHECK-NEXT: var disappearingPropertySetter: Int{{$}}
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-LABEL: class A_Sub2 : A_Sub {
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// CHECK-NEXT: func disappearingMethod()
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-LABEL: final class A_Sub3Final : Base {
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// CHECK-NEXT: func disappearingMethod()
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// CHECK-NEXT: func nullabilityChangeMethod() -> Any?
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// CHECK-NEXT: func typeChangeMethod() -> Any
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// CHECK-NEXT: func disappearingMethodWithOverload()
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// CHECK-NEXT: var disappearingProperty: Int { get }
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// CHECK-NEXT: var disappearingPropertySetter: Int{{$}}
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class A_Sub : Base {
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// CHECK-RECOVERY-NEXT: func disappearingMethod()
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// CHECK-RECOVERY-NEXT: func nullabilityChangeMethod() -> Any?
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// CHECK-RECOVERY-NEXT: func typeChangeMethod() -> Any
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// CHECK-RECOVERY-NEXT: func disappearingMethodWithOverload()
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// CHECK-RECOVERY-NEXT: /* placeholder for disappearingProperty */
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// CHECK-RECOVERY-NEXT: var disappearingPropertySetter: Int{{$}}
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class A_Sub2 : A_Sub {
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// CHECK-RECOVERY-NEXT: func disappearingMethod()
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class A_Sub3Final : Base {
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// CHECK-RECOVERY-NEXT: func disappearingMethod()
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// CHECK-RECOVERY-NEXT: func nullabilityChangeMethod() -> Any?
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// CHECK-RECOVERY-NEXT: func typeChangeMethod() -> Any
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// CHECK-RECOVERY-NEXT: func disappearingMethodWithOverload()
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// CHECK-RECOVERY-NEXT: /* placeholder for disappearingProperty */
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// CHECK-RECOVERY-NEXT: var disappearingPropertySetter: Int{{$}}
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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extension Base {
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@nonobjc func disappearingMethodWithOverload() -> SwiftOnlyClass? { return nil }
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}
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public class B_GenericSub : GenericBase<Base> {
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public override func disappearingMethod() {}
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public override func nullabilityChangeMethod() -> Base? { return nil }
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public override func typeChangeMethod() -> Any { return self }
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}
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// CHECK-LABEL: class B_GenericSub : GenericBase<Base> {
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// CHECK-NEXT: func disappearingMethod()
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// CHECK-NEXT: func nullabilityChangeMethod() -> Base?
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// CHECK-NEXT: func typeChangeMethod() -> Any
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class B_GenericSub : GenericBase<Base> {
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// CHECK-RECOVERY-NEXT: func disappearingMethod()
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// CHECK-RECOVERY-NEXT: func nullabilityChangeMethod() -> Base?
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// CHECK-RECOVERY-NEXT: func typeChangeMethod() -> Any
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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public class C1_IndexedSubscriptDisappears : IndexedSubscriptDisappearsBase {
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public override subscript(index: Int) -> Any { return self }
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}
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// CHECK-LABEL: class C1_IndexedSubscriptDisappears : IndexedSubscriptDisappearsBase {
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// CHECK-NEXT: subscript(index: Int) -> Any { get }
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class C1_IndexedSubscriptDisappears : IndexedSubscriptDisappearsBase {
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// CHECK-RECOVERY-NEXT: /* placeholder for subscript(_:) */
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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public class C2_KeyedSubscriptDisappears : KeyedSubscriptDisappearsBase {
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public override subscript(key: Any) -> Any { return key }
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}
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// CHECK-LABEL: class C2_KeyedSubscriptDisappears : KeyedSubscriptDisappearsBase {
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// CHECK-NEXT: subscript(key: Any) -> Any { get }
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class C2_KeyedSubscriptDisappears : KeyedSubscriptDisappearsBase {
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// CHECK-RECOVERY-NEXT: /* placeholder for subscript(_:) */
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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public class C3_GenericIndexedSubscriptDisappears : GenericIndexedSubscriptDisappearsBase<Base> {
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public override subscript(index: Int) -> Base { fatalError() }
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}
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// CHECK-LABEL: class C3_GenericIndexedSubscriptDisappears : GenericIndexedSubscriptDisappearsBase<Base> {
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// CHECK-NEXT: subscript(index: Int) -> Base { get }
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class C3_GenericIndexedSubscriptDisappears : GenericIndexedSubscriptDisappearsBase<Base> {
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// CHECK-RECOVERY-NEXT: /* placeholder for subscript(_:) */
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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public class C4_GenericKeyedSubscriptDisappears : GenericKeyedSubscriptDisappearsBase<Base> {
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public override subscript(key: Any) -> Base { fatalError() }
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}
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// CHECK-LABEL: class C4_GenericKeyedSubscriptDisappears : GenericKeyedSubscriptDisappearsBase<Base> {
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// CHECK-NEXT: subscript(key: Any) -> Base { get }
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class C4_GenericKeyedSubscriptDisappears : GenericKeyedSubscriptDisappearsBase<Base> {
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// CHECK-RECOVERY-NEXT: /* placeholder for subscript(_:) */
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D1_DesignatedInitDisappears : DesignatedInitDisappearsBase {
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public override init() { fatalError() }
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public override init(value: Int) { fatalError() }
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}
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// CHECK-LABEL: class D1_DesignatedInitDisappears : DesignatedInitDisappearsBase {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(value: Int)
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D1_DesignatedInitDisappears : DesignatedInitDisappearsBase {
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: /* placeholder for init(value:) */
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D2_OnlyDesignatedInitDisappears : OnlyDesignatedInitDisappearsBase {
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public override init(value: Int) { fatalError() }
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}
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// CHECK-LABEL: class D2_OnlyDesignatedInitDisappears : OnlyDesignatedInitDisappearsBase {
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// CHECK-NEXT: init(value: Int)
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D2_OnlyDesignatedInitDisappears : OnlyDesignatedInitDisappearsBase {
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// CHECK-RECOVERY-NEXT: /* placeholder for init(value:) */
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D3_ConvenienceInitDisappears : ConvenienceInitDisappearsBase {
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public override init() { fatalError() }
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}
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// CHECK-LABEL: class D3_ConvenienceInitDisappears : ConvenienceInitDisappearsBase {
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D3_ConvenienceInitDisappears : ConvenienceInitDisappearsBase {
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D4_UnknownInitDisappears : UnknownInitDisappearsBase {
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public override init() { fatalError() }
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public override init(value: Int) { fatalError() }
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}
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// CHECK-LABEL: class D4_UnknownInitDisappears : UnknownInitDisappearsBase {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(value: Int)
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D4_UnknownInitDisappears : UnknownInitDisappearsBase {
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: /* placeholder for init(value:) */
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D5_OnlyUnknownInitDisappears : OnlyUnknownInitDisappearsBase {
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public override init(value: Int) { fatalError() }
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}
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// CHECK-LABEL: class D5_OnlyUnknownInitDisappears : OnlyUnknownInitDisappearsBase {
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// CHECK-NEXT: init(value: Int)
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D5_OnlyUnknownInitDisappears : OnlyUnknownInitDisappearsBase {
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// CHECK-RECOVERY-NEXT: /* placeholder for init(value:) */
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D6_UnknownInitDisappearsGrandchild : D4_UnknownInitDisappears {
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public override init() { fatalError() }
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public override init(value: Int) { fatalError() }
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}
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// CHECK-LABEL: class D6_UnknownInitDisappearsGrandchild : D4_UnknownInitDisappears {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(value: Int)
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D6_UnknownInitDisappearsGrandchild : D4_UnknownInitDisappears {
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: /* placeholder for init(value:) */
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D7_UnknownInitDisappearsGrandchildRequired : D4_UnknownInitDisappears {
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public override init() { fatalError() }
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public required override init(value: Int) { fatalError() }
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}
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// CHECK-LABEL: class D7_UnknownInitDisappearsGrandchildRequired : D4_UnknownInitDisappears {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(value: Int)
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D7_UnknownInitDisappearsGrandchildRequired : D4_UnknownInitDisappears {
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: /* placeholder for init(value:) */
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D8_UnknownInitDisappearsRequired : UnknownInitDisappearsBase {
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public override init() { fatalError() }
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public required override init(value: Int) { fatalError() }
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}
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// CHECK-LABEL: class D8_UnknownInitDisappearsRequired : UnknownInitDisappearsBase {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(value: Int)
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D8_UnknownInitDisappearsRequired : UnknownInitDisappearsBase {
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: /* placeholder for init(value:) */
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// CHECK-RECOVERY-NEXT: {{^}$}}
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open class D9_UnknownInitDisappearsRequiredGrandchild : D8_UnknownInitDisappearsRequired {
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public override init() { fatalError() }
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public required init(value: Int) { fatalError() }
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}
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// CHECK-LABEL: class D9_UnknownInitDisappearsRequiredGrandchild : D8_UnknownInitDisappearsRequired {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(value: Int)
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class D9_UnknownInitDisappearsRequiredGrandchild : D8_UnknownInitDisappearsRequired {
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: /* placeholder for init(value:) */
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// CHECK-RECOVERY-NEXT: {{^}$}}
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public class E1_MethodWithDisappearingType : MethodWithDisappearingType {
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public override func boxItUp() -> BoxedInt { fatalError() }
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}
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// CHECK-LABEL: class E1_MethodWithDisappearingType : MethodWithDisappearingType {
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// CHECK-NEXT: override func boxItUp() -> BoxedInt
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class E1_MethodWithDisappearingType : MethodWithDisappearingType {
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// CHECK-RECOVERY-NEXT: /* placeholder for boxItUp() */
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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public class E2_InitializerStub : InitializerWithDisappearingType {
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public init(unrelatedValue: Int) { fatalError() }
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}
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// CHECK-LABEL: class E2_InitializerStub : InitializerWithDisappearingType {
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// CHECK-NEXT: init(unrelatedValue: Int)
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// CHECK-NEXT: init(boxedInt box: BoxedInt)
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// CHECK-NEXT: init()
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// CHECK-NEXT: {{^}$}}
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// CHECK-RECOVERY-LABEL: class E2_InitializerStub : InitializerWithDisappearingType {
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// CHECK-RECOVERY-NEXT: init(unrelatedValue: Int)
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// CHECK-RECOVERY-NEXT: /* placeholder for init(boxedInt:) */
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// CHECK-RECOVERY-NEXT: init()
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// CHECK-RECOVERY-NEXT: {{^}$}}
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#endif // TEST
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