@swift-main
protocol View { } struct FooView: View { } struct BarView: View { } struct TupleView<T>: View { let content: T init(_ content: T) { self.content = content } } func buildBlock<C0>(_ c0: C0) -> TupleView<(C0)> where C0 : View { TupleView(c0) } let view0: any View = FooView() print(buildBlock(view0))