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If we fail to build a generic signature (or requirement signature of a protocol) because of a request cycle or because Knuth-Bendix completion failed, we would create a placeholder signature with no requirements. However in a move-only world, a completely unconstrained generic parameter might generate spurious diagnostics when used in a copyable way. For this reason, let's outfit these placeholder signatures with a default set of conformance requirements to Copyable and Escapable.
55 lines
3.2 KiB
Swift
55 lines
3.2 KiB
Swift
// RUN: %target-typecheck-verify-swift
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protocol ABA // expected-error {{cannot build rewrite system for protocol; rule length limit exceeded}}
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// expected-note@-1 {{failed rewrite rule is [ABA:A].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:A] => [ABA:A].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B].[ABA:B]}}
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where A.B == A.B.A { // expected-error *{{is not a member type}}
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associatedtype A : ABA
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associatedtype B : ABA
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}
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protocol Undecidable // expected-error {{cannot build rewrite system for protocol; rule length limit exceeded}}
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// expected-note@-1 {{failed rewrite rule is [Undecidable:A].[Undecidable:C].[Undecidable:C].[Undecidable:C].[Undecidable:D].[Undecidable:C].[Undecidable:E].[Undecidable:E].[Undecidable:B].[Undecidable:B].[Undecidable:A].[Undecidable:B].[Undecidable:C].[Undecidable:C].[Undecidable:C].[Undecidable:D].[Undecidable:D] => [Undecidable:A].[Undecidable:C].[Undecidable:C].[Undecidable:C].[Undecidable:D].[Undecidable:C].[Undecidable:C].[Undecidable:C].[Undecidable:C].[Undecidable:D].[Undecidable:D].[Undecidable:E].[Undecidable:A].[Undecidable:B]}}
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where A.C == C.A, // expected-error *{{is not a member type}}
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A.D == D.A, // expected-error *{{is not a member type}}
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B.C == C.B, // expected-error *{{is not a member type}}
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B.D == D.B, // expected-error *{{is not a member type}}
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C.E == E.C.A, // expected-error *{{is not a member type}}
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D.E == E.D.B, // expected-error *{{is not a member type}}
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C.C.A == C.C.A.E { // expected-error *{{is not a member type}}
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associatedtype A : Undecidable
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associatedtype B : Undecidable
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associatedtype C : Undecidable
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associatedtype D : Undecidable
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associatedtype E : Undecidable
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}
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protocol P1 {
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associatedtype T : P1
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}
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protocol P2 {
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associatedtype T : P2
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}
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func foo<T : P1 & P2>(_: T) {}
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// expected-error@-1 {{cannot build rewrite system for generic signature; rule length limit exceeded}}
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// expected-note@-2 {{failed rewrite rule is τ_0_0.[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P2] => τ_0_0.[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T]}}
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extension P1 where Self : P2 {}
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// expected-error@-1 {{cannot build rewrite system for generic signature; rule length limit exceeded}}
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// expected-note@-2 {{failed rewrite rule is τ_0_0.[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P2] => τ_0_0.[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T]}}
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struct S<U : P1> : P1 {
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typealias T = S<S<U>>
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}
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protocol P3Base {
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associatedtype T : P1
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associatedtype U : P1
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}
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protocol P3 : P3Base where T == S<U> {
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// expected-error@-1 {{cannot build rewrite system for protocol; rule length limit exceeded}}
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// expected-note@-2 {{failed rewrite rule is [P3:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[concrete: S<S<S<S<S<S<S<S<S<S<S<S<S<S<[P3:U]>>>>>>>>>>>>>>] => [P3:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T].[P1:T]}}
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}
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