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ec4a125f3e
If the extension adds conformance to an invertible protocol, it's confusing for people to also infer conditional requirements on the generic parameters for those invertible protocols. This came up in the review of SE-427.
55 lines
1.9 KiB
Swift
55 lines
1.9 KiB
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend %S/Inputs/ncgenerics.swift \
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// RUN: -enable-experimental-feature SuppressedAssociatedTypes \
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// RUN: -emit-module -module-name ncgenerics \
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// RUN: -o %t
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// RUN: llvm-bcanalyzer %t/ncgenerics.swiftmodule | %FileCheck %s
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// RUN: %target-typecheck-verify-swift -I %t
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// RUN: %target-swift-ide-test(mock-sdk: %clang-importer-sdk) \
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// RUN: -enable-experimental-feature SuppressedAssociatedTypes \
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// RUN: -print-module -module-to-print=ncgenerics \
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// RUN: -I %t -source-filename=%s \
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// RUN: | %FileCheck -check-prefix=CHECK-PRINT %s
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// CHECK-NOT: UnknownCode
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// CHECK-PRINT-DAG: protocol Generator<Value> {
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// CHECK-PRINT-DAG: enum Maybe<Wrapped> : ~Copyable where Wrapped : ~Copyable {
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// CHECK-PRINT-DAG: extension Maybe : Copyable where Wrapped : Copyable {
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// CHECK-PRINT-DAG: func ncIdentity<T>(_ t: consuming T) -> T where T : ~Copyable
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// CHECK-PRINT-DAG: protocol Either<Left, Right> : ~Copyable {
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// CHECK-PRINT-DAG: associatedtype Left : ~Copyable
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// CHECK-PRINT-DAG: associatedtype Right : ~Copyable
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import ncgenerics
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struct TestRequirements: Generator {
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func next() -> Int? { return .none }
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}
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struct NC: ~Copyable {}
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struct RegularStruct {}
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func isItCopyable<T: Copyable>(_ t: T) {}
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// expected-note@-1 {{'where T: Copyable' is implicit here}}
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func check() {
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var tr = TestRequirements()
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advance(by: 12, &tr)
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isItCopyable(TestRequirements())
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isItCopyable(RegularStruct())
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isItCopyable(NC()) // expected-error {{global function 'isItCopyable' requires that 'NC' conform to 'Copyable'}}
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let x: Maybe<NC> = .none
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}
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struct Witness: Either {
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typealias Left = Maybe<RegularStruct>
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typealias Right = Maybe<NC>
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}
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