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68957078c5
If we don't set this flag, we can end up making an invalid GSB into the canonical builder for some signature. This was caught by requirement machine cross-checking on the compiler_crashers suite.
109 lines
3.3 KiB
Swift
109 lines
3.3 KiB
Swift
// RUN: %target-typecheck-verify-swift
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protocol SomeProtocol {
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associatedtype T
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}
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extension SomeProtocol where T == Optional<T> { } // expected-error{{same-type constraint 'Self.T' == 'Optional<Self.T>' is recursive}}
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// rdar://problem/19840527
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class X<T> where T == X { // expected-error{{same-type constraint 'T' == 'X<T>' is recursive}}
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// expected-error@-1{{same-type requirement makes generic parameter 'T' non-generic}}
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var type: T { return Swift.type(of: self) } // expected-error{{cannot convert return expression of type 'X<T>.Type' to return type 'T'}}
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}
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// FIXME: The "associated type 'Foo' is not a member type of 'Self'" diagnostic
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// should also become "associated type 'Foo' references itself"
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protocol CircularAssocTypeDefault {
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associatedtype Z = Z // expected-error{{associated type 'Z' references itself}}
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// expected-note@-1{{type declared here}}
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// expected-note@-2{{protocol requires nested type 'Z'; do you want to add it?}}
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associatedtype Z2 = Z3
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// expected-note@-1{{protocol requires nested type 'Z2'; do you want to add it?}}
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associatedtype Z3 = Z2
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// expected-note@-1{{protocol requires nested type 'Z3'; do you want to add it?}}
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associatedtype Z4 = Self.Z4 // expected-error{{associated type 'Z4' references itself}}
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// expected-note@-1{{type declared here}}
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// expected-note@-2{{protocol requires nested type 'Z4'; do you want to add it?}}
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associatedtype Z5 = Self.Z6
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// expected-note@-1{{protocol requires nested type 'Z5'; do you want to add it?}}
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associatedtype Z6 = Self.Z5
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// expected-note@-1{{protocol requires nested type 'Z6'; do you want to add it?}}
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}
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struct ConformsToCircularAssocTypeDefault : CircularAssocTypeDefault { }
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// expected-error@-1 {{type 'ConformsToCircularAssocTypeDefault' does not conform to protocol 'CircularAssocTypeDefault'}}
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// rdar://problem/20000145
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public protocol P {
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associatedtype T
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}
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public struct S<A: P> where A.T == S<A> { // expected-error {{circular reference}}
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// expected-note@-1 {{type declared here}}
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// expected-error@-2 {{generic struct 'S' references itself}}
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// expected-note@-3 {{while resolving type 'S<A>'}}
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func f(a: A.T) {
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g(a: id(t: a)) // `a` has error type which is diagnosed as circular reference
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// expected-error@-1 {{conflicting arguments to generic parameter 'T' ('A.T' (associated type of protocol 'P') vs. 'S<A>')}}
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_ = A.T.self
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}
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func g(a: S<A>) {
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f(a: id(t: a))
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// expected-error@-1 {{conflicting arguments to generic parameter 'T' ('S<A>' vs. 'A.T' (associated type of protocol 'P'))}}
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_ = S<A>.self
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}
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func id<T>(t: T) -> T {
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return t
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}
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}
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protocol I {
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init()
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}
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protocol PI {
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associatedtype T : I
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}
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struct SI<A: PI> : I where A : I, A.T == SI<A> { // expected-error {{circular reference}}
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// expected-note@-1 {{type declared here}}
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// expected-error@-2 {{generic struct 'SI' references itself}}
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// expected-note@-3 {{while resolving type 'SI<A>'}}
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func ggg<T : I>(t: T.Type) -> T {
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return T()
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}
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func foo() {
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_ = A()
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_ = A.T()
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_ = SI<A>()
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_ = ggg(t: A.self)
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_ = ggg(t: A.T.self)
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_ = self.ggg(t: A.self)
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_ = self.ggg(t: A.T.self)
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}
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}
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// Used to hit infinite recursion
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struct S4<A: PI> : I where A : I {
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}
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struct S5<A: PI> : I where A : I, A.T == S4<A> { }
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// Used to hit ArchetypeBuilder assertions
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struct SU<A: P> where A.T == SU {
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}
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struct SIU<A: PI> : I where A : I, A.T == SIU {
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}
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