Async overloading in protocol implementation fails
Originator: | patskovn | ||
Number: | rdar://FB9595388 | Date Originated: | 3/9/2021 |
Status: | Open | Resolved: | |
Product: | Swift Compiler | Product Version: | Apple Swift version 5.3.1 (swiftlang-1200.0.41 clang-1200.0.32.8) |
Classification: | Reproducible: | yes |
Amendment https://github.com/apple/swift-evolution/pull/1392 is incomplete. Compilation fails, when class trying to satisfy protocol requirement with both sync and async method or just async method implementation. ```swift protocol TestProtocol { func read() // Compilation also fails if TestProtocol contains only async version func read() async } // Note: everything compiles and resolves correctly when TestClass does not implement TestProtocol class TestClass: TestProtocol { func read() {} func read() async {} } ``` Throws several issues: error: type 'TestClass' does not conform to protocol 'TestProtocol' note: multiple matching functions named 'read()' with type '() async -> ()'
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