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de66b0c25c
Introduce a warning about redeclaring the associated types from an inherited protocol in the protocol being checked: * If the new declaration is an associated type, note that the declaration could be replaced by requirements in the protocol's where clause. * If the new declaration is a typealias, note that it could be replaced by a same-type constraint in the protocol's where clause.
74 lines
2.1 KiB
Swift
74 lines
2.1 KiB
Swift
// RUN: %target-typecheck-verify-swift -typecheck -swift-version 4 %s -verify
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// RUN: %target-typecheck-verify-swift -typecheck -swift-version 4 -debug-generic-signatures %s > %t.dump 2>&1
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// RUN: %FileCheck %s < %t.dump
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protocol P0 { }
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protocol Q0: P0 { }
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protocol P1 {
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associatedtype AssocP1: Q0
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func getAssocP1() -> AssocP1
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}
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protocol P2 : P1 {
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associatedtype AssocP2: P1
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func getAssocP2() -> AssocP2
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}
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protocol P3 {
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associatedtype AssocP3: P0
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func getAssocP3() -> AssocP3
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}
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protocol P4: P3 { }
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protocol P5 : P4 {
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associatedtype AssocP5 where AssocP3: Q0
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}
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func acceptP0<T: P0>(_: T) { }
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func acceptQ0<T: Q0>(_: T) { }
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func acceptP1<T: P1>(_: T) { }
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func acceptP2<T: P2>(_: T) { }
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func acceptP3<T: P3>(_: T) { }
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func testPaths1<T: P2 & P4>(_ t: T) {
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// CHECK: Conformance access path for T.AssocP2.AssocP1: P0 is T: P2 -> τ_0_0.AssocP2: P1 -> τ_0_0.AssocP1: Q0 -> τ_0_0: P0
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acceptP0(t.getAssocP2().getAssocP1())
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// CHECK: Conformance access path for T.AssocP3: P0 is T: P4 -> τ_0_0: P3 -> τ_0_0.AssocP3: P0
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acceptP0(t.getAssocP3())
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}
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func testPaths2<U: P2 & P4>(_ t: U) where U.AssocP3 == U.AssocP2.AssocP1 {
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// CHECK: Conformance access path for U.AssocP3: P0 is U: P4 -> τ_0_0: P3 -> τ_0_0.AssocP3: P0
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acceptP0(t.getAssocP2().getAssocP1())
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}
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func testPaths3<V: P5>(_ v: V) {
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// CHECK: Conformance access path for V.AssocP3: P0 is V: P5 -> τ_0_0.AssocP3: Q0 -> τ_0_0: P0
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acceptP0(v.getAssocP3())
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// CHECK: Conformance access path for V.AssocP3: Q0 is V: P5 -> τ_0_0.AssocP3: Q0
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acceptQ0(v.getAssocP3())
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}
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protocol P6Unordered: P5Unordered { // expected-note{{conformance constraint 'Self.A': 'P0' implied here}}
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associatedtype A: P0 // expected-warning{{redundant conformance constraint 'Self.A': 'P0'}}
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// expected-warning@-1{{redeclaration of associated type 'A'}}
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}
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protocol P5Unordered {
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associatedtype A: P0 // expected-note{{'A' declared here}}
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func getA() -> A
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}
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func testUnorderedP5_P6<W: P6Unordered>(_ w: W) {
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// CHECK: Conformance access path for W.A: P0 is W: P6Unordered -> τ_0_0: P5Unordered -> τ_0_0.A: P0
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acceptP0(w.getA())
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}
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