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63504e4099
When computing the requirement signature of a protocol, eliminate requirement sources that are self-derived by virtual of using a given requirement of that protocol to prove that same constraint.
95 lines
2.1 KiB
Swift
95 lines
2.1 KiB
Swift
// RUN: %target-typecheck-verify-swift
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// RUN: %target-typecheck-verify-swift -typecheck -debug-generic-signatures %s > %t.dump 2>&1
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// RUN: %FileCheck %s < %t.dump
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protocol P {
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associatedtype Assoc : P
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var assoc: Assoc { get }
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}
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func testP<T: P>(_ t: T) {
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testP(t.assoc)
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testP(t.assoc.assoc)
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testP(t.assoc.assoc.assoc)
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testP(t.assoc.assoc.assoc.assoc.assoc.assoc.assoc)
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}
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// SR-5485
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protocol P1 {
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associatedtype X : P2
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}
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// CHECK-LABEL: .P2@
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// CHECK: Requirement signature: <Self where Self == Self.Y.X, Self.Y : P1, Self.Z : P1>
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protocol P2 {
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associatedtype Y : P1 where Y.X == Self
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associatedtype Z : P1
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}
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// SR-5473
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protocol P3 {
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associatedtype X : P4
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}
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// CHECK-LABEL: .P4@
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// CHECK: Requirement signature: <Self where Self == Self.Y.X, Self.Y : P3, Self.Z : P3, Self.Y.X == Self.Z.X>
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protocol P4 {
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associatedtype Y: P3 where Y.X == Self
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associatedtype Z: P3 where Z.X == Self
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}
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protocol P5 {
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associatedtype X : P5
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where X.X == X
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}
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// CHECK-LABEL: .P6@
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// CHECK: Requirement signature: <Self where Self : P5, Self.Y : P5>
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protocol P6 : P5 {
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associatedtype Y : P5
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}
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// CHECK: Generic signature: <Self where Self : P6, Self.X == Self.Y.X>
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extension P6 where X == Y.X { }
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// SR-5601
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protocol P7 {
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associatedtype X: P9 where X.Q == Self, X.R == UInt8
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associatedtype Y: P9 where Y.Q == Self, Y.R == UInt16
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// NOTE: Removing either X or Y from P7 (and A7) makes the program compile.
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}
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struct A7: P7 {
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typealias X = S9<UInt8>
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typealias Y = S9<UInt16>
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}
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protocol P8 { }
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protocol P9 : P8 { // NOTE: Removing ": P8 " here makes the program compile.
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associatedtype Q: P7
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associatedtype R
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}
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struct S9<E> : P9 {
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typealias R = E
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typealias Q = A7
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}
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// SR-5610
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protocol P10 {
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associatedtype X : P11 where X.Q == Self
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}
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protocol P11 {
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associatedtype Q : P10
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// CHECK-LABEL: .P11.map@
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// CHECK: Generic signature: <Self, T where Self : P11, T : P11, Self.Q == T.Q>
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func map<T>(_: T.Type) where T : P11, Q == T.Q
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}
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// Redundances within a requirement signature.
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protocol P12 { }
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protocol P13 {
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associatedtype AT1 : P12
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associatedtype AT2: P13 where AT2.AT1 == AT1
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}
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