Description

I imagine this is a limitation and these methods can't be overridden, but it's hard to tell with the bad diagnostic message.

Reproduction

protocol P {} struct A1: P {} struct A2: P {} class C { func f() -> some P { A1() } } class D: C { // Error: Method does not override any method from its superclass override func f() -> some P { A2() } }

Expected behavior

An actual error explaining why this isn't possible.

Environment

swift-driver version: 1.87.3 Apple Swift version 5.9.2 (swiftlang-5.9.2.2.56 clang-1500.1.0.2.5)
Target: arm64-apple-macosx14.0