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6a83e7303e
We used to give witness thunks public linkage if the conforming type and the protocol are public. This is completely unnecessary. If the conformance is fragile, the thunk should be [shared] [serialized], allowing the thunk to be serialized into callers after devirtualization. Otherwise for private protocols or resilient modules, witness thunks can just always be private. This should reduce the size of compiled binaries. There are two other mildly interesting consequences: 1) In the bridged cast tests, we now inline the witness thunks from the bridgeable conformances, which removes one level of indirection. 2) This uncovered a flaw in our accessibility checking model. Usually, we reject a witness that is less visible than the protocol; however, we fail to reject it in the case that it comes from an extension. This is because members of an extension can be declared 'public' even if the extended type is not public, and it appears that in this case the 'public' keyword has no effect. I would prefer it if a) 'public' generated a warning here, and b) the conformance also generated a warning. In Swift 4 mode, we could then make this kind of sillyness into an error. But for now, live with the broken behavior, and add a test to exercise it to ensure we don't crash. There are other places where this "allow public but ignore it, kinda, except respect it in some places" behavior causes problems. I don't know if it was intentional or just emergent behavior from general messiness in Sema. 3) In the TBD code, there is one less 'failure' because now that witness thunks are no longer public, TBDGen does not need to reason about them (except for the case #2 above, which will probably require a similar workaround in TBDGen as what I put into SILGen).
324 lines
17 KiB
Swift
324 lines
17 KiB
Swift
// RUN: rm -rf %t && mkdir %t
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// RUN: %target-swift-frontend -emit-module -enable-resilience -emit-module-path=%t/resilient_protocol.swiftmodule -module-name=resilient_protocol %S/../Inputs/resilient_protocol.swift
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// RUN: %target-swift-frontend -I %t -emit-silgen -enable-resilience %s | %FileCheck %s
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import resilient_protocol
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prefix operator ~~~ {}
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infix operator <*> {}
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infix operator <**> {}
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infix operator <===> {}
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public protocol P {}
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// Protocol is public -- needs resilient witness table
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public protocol ResilientMethods {
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associatedtype AssocType : P
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func defaultWitness()
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func anotherDefaultWitness(_ x: Int) -> Self
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func defaultWitnessWithAssociatedType(_ a: AssocType)
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func defaultWitnessMoreAbstractThanRequirement(_ a: AssocType, b: Int)
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func defaultWitnessMoreAbstractThanGenericRequirement<T>(_ a: AssocType, t: T)
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func noDefaultWitness()
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func defaultWitnessIsNotPublic()
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static func staticDefaultWitness(_ x: Int) -> Self
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}
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extension ResilientMethods {
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientMethodsP14defaultWitnessyyF
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientMethodsPAAE14defaultWitnessyyF
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public func defaultWitness() {}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientMethodsP21anotherDefaultWitnessxSiF
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientMethodsPAAE21anotherDefaultWitnessxSiF
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public func anotherDefaultWitness(_ x: Int) -> Self {}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientMethodsP32defaultWitnessWithAssociatedTypey05AssocI0QzF
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientMethodsPAAE32defaultWitnessWithAssociatedTypey05AssocI0QzF
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public func defaultWitnessWithAssociatedType(_ a: AssocType) {}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientMethodsP41defaultWitnessMoreAbstractThanRequirementy9AssocTypeQz_Si1btF
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientMethodsPAAE41defaultWitnessMoreAbstractThanRequirementyqd___qd_0_1btr0_lF
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public func defaultWitnessMoreAbstractThanRequirement<A, T>(_ a: A, b: T) {}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientMethodsP48defaultWitnessMoreAbstractThanGenericRequirementy9AssocTypeQz_qd__1ttlF
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientMethodsPAAE48defaultWitnessMoreAbstractThanGenericRequirementyqd___qd_0_1ttr0_lF
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public func defaultWitnessMoreAbstractThanGenericRequirement<A, T>(_ a: A, t: T) {}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientMethodsP20staticDefaultWitnessxSiFZ
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientMethodsPAAE20staticDefaultWitnessxSiFZ
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public static func staticDefaultWitness(_ x: Int) -> Self {}
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// CHECK-LABEL: sil private @_T019protocol_resilience16ResilientMethodsPAAE25defaultWitnessIsNotPublic{{.*}}F
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private func defaultWitnessIsNotPublic() {}
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}
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public protocol ResilientConstructors {
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init(noDefault: ())
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init(default: ())
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init?(defaultIsOptional: ())
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init?(defaultNotOptional: ())
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init(optionalityMismatch: ())
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}
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extension ResilientConstructors {
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience21ResilientConstructorsPxyt7default_tcfC
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// CHECK-LABEL: sil @_T019protocol_resilience21ResilientConstructorsPAAExyt7default_tcfC
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public init(default: ()) {
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self.init(noDefault: ())
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}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience21ResilientConstructorsPxSgyt17defaultIsOptional_tcfC
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// CHECK-LABEL: sil @_T019protocol_resilience21ResilientConstructorsPAAExSgyt17defaultIsOptional_tcfC
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public init?(defaultIsOptional: ()) {
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self.init(noDefault: ())
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}
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// CHECK-LABEL: sil @_T019protocol_resilience21ResilientConstructorsPAAExyt20defaultIsNotOptional_tcfC
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public init(defaultIsNotOptional: ()) {
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self.init(noDefault: ())
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}
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// CHECK-LABEL: sil @_T019protocol_resilience21ResilientConstructorsPAAExSgyt19optionalityMismatch_tcfC
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public init?(optionalityMismatch: ()) {
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self.init(noDefault: ())
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}
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}
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public protocol ResilientStorage {
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associatedtype T : ResilientConstructors
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var propertyWithDefault: Int { get }
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var propertyWithNoDefault: Int { get }
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var mutablePropertyWithDefault: Int { get set }
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var mutablePropertyNoDefault: Int { get set }
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var mutableGenericPropertyWithDefault: T { get set }
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subscript(x: T) -> T { get set }
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var mutatingGetterWithNonMutatingDefault: Int { mutating get set }
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}
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extension ResilientStorage {
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP19propertyWithDefaultSifg
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE19propertyWithDefaultSifg
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public var propertyWithDefault: Int {
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get { return 0 }
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}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP26mutablePropertyWithDefaultSifg
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE26mutablePropertyWithDefaultSifg
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP26mutablePropertyWithDefaultSifs
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE26mutablePropertyWithDefaultSifs
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// CHECK-LABEL: sil private [transparent] @_T019protocol_resilience16ResilientStorageP26mutablePropertyWithDefaultSifmytfU_
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP26mutablePropertyWithDefaultSifm
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public var mutablePropertyWithDefault: Int {
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get { return 0 }
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set { }
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}
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public private(set) var mutablePropertyNoDefault: Int {
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get { return 0 }
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set { }
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}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP33mutableGenericPropertyWithDefault1TQzfg
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE33mutableGenericPropertyWithDefault1TQzfg
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP33mutableGenericPropertyWithDefault1TQzfs
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE33mutableGenericPropertyWithDefault1TQzfs
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// CHECK-LABEL: sil private [transparent] @_T019protocol_resilience16ResilientStorageP33mutableGenericPropertyWithDefault1TQzfmytfU_
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP33mutableGenericPropertyWithDefault1TQzfm
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public var mutableGenericPropertyWithDefault: T {
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get {
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return T(default: ())
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}
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set { }
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}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP9subscript1TQzAFcfg
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE9subscript1TQzAFcfg
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP9subscript1TQzAFcfs
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE9subscript1TQzAFcfs
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// CHECK-LABEL: sil private [transparent] @_T019protocol_resilience16ResilientStorageP9subscript1TQzAFcfmytfU_
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP9subscript1TQzAFcfm
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public subscript(x: T) -> T {
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get {
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return x
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}
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set { }
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}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP36mutatingGetterWithNonMutatingDefaultSifg
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE36mutatingGetterWithNonMutatingDefaultSifg
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP36mutatingGetterWithNonMutatingDefaultSifs
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// CHECK-LABEL: sil @_T019protocol_resilience16ResilientStoragePAAE36mutatingGetterWithNonMutatingDefaultSifs
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// CHECK-LABEL: sil private [transparent] @_T019protocol_resilience16ResilientStorageP36mutatingGetterWithNonMutatingDefaultSifmytfU_
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16ResilientStorageP36mutatingGetterWithNonMutatingDefaultSifm
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public var mutatingGetterWithNonMutatingDefault: Int {
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get {
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return 0
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}
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set { }
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}
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}
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public protocol ResilientOperators {
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associatedtype AssocType : P
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static prefix func ~~~(s: Self)
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static func <*><T>(s: Self, t: T)
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static func <**><T>(t: T, s: Self) -> AssocType
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static func <===><T : ResilientOperators>(t: T, s: Self) -> T.AssocType
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}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience18ResilientOperatorsP3tttopyxFZ
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// CHECK-LABEL: sil @_T019protocol_resilience3tttopyxlF
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public prefix func ~~~<S>(s: S) {}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience18ResilientOperatorsP3lmgoiyx_qd__tlFZ
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// CHECK-LABEL: sil @_T019protocol_resilience3lmgoiyq__xtr0_lF
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public func <*><T, S>(s: S, t: T) {}
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// Swap the generic parameters to make sure we don't mix up our DeclContexts
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// when mapping interface types in and out
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience18ResilientOperatorsP4lmmgoi9AssocTypeQzqd___xtlFZ
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// CHECK-LABEL: sil @_T019protocol_resilience4lmmgoi9AssocTypeQzq__xtAA18ResilientOperatorsRzr0_lF
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public func <**><S : ResilientOperators, T>(t: T, s: S) -> S.AssocType {}
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience18ResilientOperatorsP5leeegoi9AssocTypeQyd__qd___xtAaBRd__lFZ
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// CHECK-LABEL: sil @_T019protocol_resilience5leeegoi9AssocTypeQzx_q_tAA18ResilientOperatorsRzAaER_r0_lF
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public func <===><T : ResilientOperators, S : ResilientOperators>(t: T, s: S) -> T.AssocType {}
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public protocol ReabstractSelfBase {
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// No requirements
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}
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public protocol ReabstractSelfRefined : class, ReabstractSelfBase {
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// A requirement with 'Self' abstracted as a class instance
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var callback: (Self) -> Self { get set }
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}
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func id<T>(_ t: T) -> T {}
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extension ReabstractSelfBase {
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// A witness for the above requirement, but with 'Self' maximally abstracted
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public var callback: (Self) -> Self {
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get { return id }
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nonmutating set { }
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}
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}
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final class X : ReabstractSelfRefined {}
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func inoutFunc(_ x: inout Int) {}
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// CHECK-LABEL: sil hidden @_T019protocol_resilience22inoutResilientProtocoly010resilient_A005OtherdE0_pzF
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func inoutResilientProtocol(_ x: inout OtherResilientProtocol) {
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// CHECK: function_ref @_T018resilient_protocol22OtherResilientProtocolPAAE19propertyInExtensionSifm
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inoutFunc(&x.propertyInExtension)
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}
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struct OtherConformingType : OtherResilientProtocol {}
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// CHECK-LABEL: sil hidden @_T019protocol_resilience22inoutResilientProtocolyAA19OtherConformingTypeVzF
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func inoutResilientProtocol(_ x: inout OtherConformingType) {
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// CHECK: function_ref @_T018resilient_protocol22OtherResilientProtocolPAAE19propertyInExtensionSifm
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inoutFunc(&x.propertyInExtension)
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// CHECK: function_ref @_T018resilient_protocol22OtherResilientProtocolPAAE25staticPropertyInExtensionSifmZ
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inoutFunc(&OtherConformingType.staticPropertyInExtension)
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}
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// Protocol is not public -- make sure default witnesses have the right linkage
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protocol InternalProtocol {
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func noDefaultF()
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func defaultG()
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}
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extension InternalProtocol {
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// CHECK-LABEL: sil private [transparent] [thunk] @_T019protocol_resilience16InternalProtocolP8defaultGyyF
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// CHECK: return
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func defaultG() {}
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}
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// CHECK-LABEL: sil_default_witness_table P {
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// CHECK-NEXT: }
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// CHECK-LABEL: sil_default_witness_table ResilientMethods {
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// CHECK-NEXT: no_default
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #ResilientMethods.defaultWitness!1: {{.*}} : @_T019protocol_resilience16ResilientMethodsP14defaultWitnessyyF
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// CHECK-NEXT: method #ResilientMethods.anotherDefaultWitness!1: {{.*}} : @_T019protocol_resilience16ResilientMethodsP21anotherDefaultWitnessxSiF
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// CHECK-NEXT: method #ResilientMethods.defaultWitnessWithAssociatedType!1: {{.*}} : @_T019protocol_resilience16ResilientMethodsP32defaultWitnessWithAssociatedTypey05AssocI0QzF
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// CHECK-NEXT: method #ResilientMethods.defaultWitnessMoreAbstractThanRequirement!1: {{.*}} : @_T019protocol_resilience16ResilientMethodsP41defaultWitnessMoreAbstractThanRequirementy9AssocTypeQz_Si1btF
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// CHECK-NEXT: method #ResilientMethods.defaultWitnessMoreAbstractThanGenericRequirement!1: {{.*}} : @_T019protocol_resilience16ResilientMethodsP48defaultWitnessMoreAbstractThanGenericRequirementy9AssocTypeQz_qd__1ttlF
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// CHECK-NEXT: no_default
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #ResilientMethods.staticDefaultWitness!1: {{.*}} : @_T019protocol_resilience16ResilientMethodsP20staticDefaultWitnessxSiFZ
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// CHECK-NEXT: }
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// CHECK-LABEL: sil_default_witness_table ResilientConstructors {
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #ResilientConstructors.init!allocator.1: {{.*}} : @_T019protocol_resilience21ResilientConstructorsPxyt7default_tcfC
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// CHECK-NEXT: method #ResilientConstructors.init!allocator.1: {{.*}} : @_T019protocol_resilience21ResilientConstructorsPxSgyt17defaultIsOptional_tcfC
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// CHECK-NEXT: no_default
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// CHECK-NEXT: no_default
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// CHECK-NEXT: }
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// CHECK-LABEL: sil_default_witness_table ResilientStorage {
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// CHECK-NEXT: no_default
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #ResilientStorage.propertyWithDefault!getter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP19propertyWithDefaultSifg
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #ResilientStorage.mutablePropertyWithDefault!getter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP26mutablePropertyWithDefaultSifg
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// CHECK-NEXT: method #ResilientStorage.mutablePropertyWithDefault!setter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP26mutablePropertyWithDefaultSifs
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// CHECK-NEXT: method #ResilientStorage.mutablePropertyWithDefault!materializeForSet.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP26mutablePropertyWithDefaultSifm
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// CHECK-NEXT: no_default
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// CHECK-NEXT: no_default
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #ResilientStorage.mutableGenericPropertyWithDefault!getter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP33mutableGenericPropertyWithDefault1TQzfg
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// CHECK-NEXT: method #ResilientStorage.mutableGenericPropertyWithDefault!setter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP33mutableGenericPropertyWithDefault1TQzfs
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// CHECK-NEXT: method #ResilientStorage.mutableGenericPropertyWithDefault!materializeForSet.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP33mutableGenericPropertyWithDefault1TQzfm
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// CHECK-NEXT: method #ResilientStorage.subscript!getter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP9subscript1TQzAFcfg
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// CHECK-NEXT: method #ResilientStorage.subscript!setter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP9subscript1TQzAFcfs
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// CHECK-NEXT: method #ResilientStorage.subscript!materializeForSet.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP9subscript1TQzAFcfm
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// CHECK-NEXT: method #ResilientStorage.mutatingGetterWithNonMutatingDefault!getter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP36mutatingGetterWithNonMutatingDefaultSifg
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// CHECK-NEXT: method #ResilientStorage.mutatingGetterWithNonMutatingDefault!setter.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP36mutatingGetterWithNonMutatingDefaultSifs
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// CHECK-NEXT: method #ResilientStorage.mutatingGetterWithNonMutatingDefault!materializeForSet.1: {{.*}} : @_T019protocol_resilience16ResilientStorageP36mutatingGetterWithNonMutatingDefaultSifm
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// CHECK-NEXT: }
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// CHECK-LABEL: sil_default_witness_table ResilientOperators {
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// CHECK-NEXT: no_default
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #ResilientOperators."~~~"!1: {{.*}} : @_T019protocol_resilience18ResilientOperatorsP3tttopyxFZ
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// CHECK-NEXT: method #ResilientOperators."<*>"!1: {{.*}} : @_T019protocol_resilience18ResilientOperatorsP3lmgoiyx_qd__tlFZ
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// CHECK-NEXT: method #ResilientOperators."<**>"!1: {{.*}} : @_T019protocol_resilience18ResilientOperatorsP4lmmgoi9AssocTypeQzqd___xtlFZ
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// CHECK-NEXT: method #ResilientOperators."<===>"!1: {{.*}} : @_T019protocol_resilience18ResilientOperatorsP5leeegoi9AssocTypeQyd__qd___xtAaBRd__lFZ
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// CHECK-NEXT: }
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// CHECK-LABEL: sil_default_witness_table ReabstractSelfRefined {
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #ReabstractSelfRefined.callback!getter.1: {{.*}} : @_T019protocol_resilience21ReabstractSelfRefinedP8callbackxxcfg
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// CHECK-NEXT: method #ReabstractSelfRefined.callback!setter.1: {{.*}} : @_T019protocol_resilience21ReabstractSelfRefinedP8callbackxxcfs
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// CHECK-NEXT: method #ReabstractSelfRefined.callback!materializeForSet.1: {{.*}} : @_T019protocol_resilience21ReabstractSelfRefinedP8callbackxxcfm
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// CHECK-NEXT: }
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// CHECK-LABEL: sil_default_witness_table hidden InternalProtocol {
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// CHECK-NEXT: no_default
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// CHECK-NEXT: method #InternalProtocol.defaultG!1: {{.*}} : @_T019protocol_resilience16InternalProtocolP8defaultGyyF
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// CHECK-NEXT: }
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