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de323b5bef
If the -enable-experimental-subclass-existentials staging flag is on, resolveType() now allows protocol compositions to contain class types. It also diagnoses if a composition has more than one superclass requirement. Also, change diagnostics that talked about 'protocol composition' to 'protocol-constrained type'. Since such types can now contain a superclass constraint, it's not correct to call them protocol composition. "Protocol-constrained type" isn't quite accurate either because 'Any' has no protocols, and 'AnyObject' will have no protocols but a general class constraint; but those are edge cases which won't come up in these diagnostics.
50 lines
2.2 KiB
Swift
50 lines
2.2 KiB
Swift
// RUN: rm -rf %t && mkdir -p %t
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// RUN: %utils/split_file.py -o %t %s
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// RUN: %target-swift-frontend -typecheck -primary-file %t/swift3.swift %t/common.swift -verify -swift-version 3
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// RUN: %target-swift-frontend -typecheck -primary-file %t/swift4.swift %t/common.swift -verify -swift-version 4
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// BEGIN common.swift
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protocol P1 {
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static func p1() -> Int
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}
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protocol P2 {
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static var p2: Int { get }
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}
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// BEGIN swift3.swift
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// Warning for mistakenly accepted protocol composition production.
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func foo(x: P1 & Any & P2.Type?) {
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// expected-warning @-1 {{protocol-constrained type with postfix '.Type' is ambiguous and will be rejected in future version of Swift}} {{13-13=(}} {{26-26=)}}
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let _: (P1 & P2).Type? = x
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let _: (P1 & P2).Type = x!
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let _: Int = x!.p1()
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let _: Int? = x?.p2
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}
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// Type expression
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func bar() -> ((P1 & P2)?).Type {
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let x = (P1 & P2?).self
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// expected-warning @-1 {{protocol-constrained type with postfix '?' is ambiguous and will be rejected in future version of Swift}} {{12-12=(}} {{19-19=)}}
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return x
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}
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// Non-ident type at non-last position are rejected anyway.
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typealias A1 = P1.Type & P2 // expected-error {{non-protocol, non-class type 'P1.Type' cannot be used within a protocol-constrained type}}
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// BEGIN swift4.swift
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func foo(x: P1 & Any & P2.Type?) { // expected-error {{non-protocol, non-class type 'P2.Type?' cannot be used within a protocol-constrained type}}
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let _: (P1 & P2).Type? = x // expected-error {{cannot convert value of type 'P1' to specified type '(P1 & P2).Type?'}}
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let _: (P1 & P2).Type = x! // expected-error {{cannot force unwrap value of non-optional type 'P1'}}
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let _: Int = x!.p1() // expected-error {{cannot force unwrap value of non-optional type 'P1'}}
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let _: Int? = x?.p2 // expected-error {{cannot use optional chaining on non-optional value of type 'P1'}}
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}
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func bar() -> ((P1 & P2)?).Type {
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let x = (P1 & P2?).self // expected-error {{non-protocol, non-class type 'P2?' cannot be used within a protocol-constrained type}}
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return x // expected-error {{cannot convert return expression}}
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}
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typealias A1 = P1.Type & P2 // expected-error {{non-protocol, non-class type 'P1.Type' cannot be used within a protocol-constrained type}}
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