無理やり呼び出せば呼べるので、謎

struct TwerkModifier: ViewModifier { func body(content: Content) -> some View { Wrapper(view: content) } struct Wrapper<T: View>: View { var view: T var body: some View { return view.body } } } struct UsageView: View { var body: some View { // SwiftUI/DynamicProperty.swift:338: Fatal error: ViewWrapper<_ViewModifier_Content<TwerkModifier>> may not have Body == Never Text("Foo") .modifier(TwerkModifier()) } }

(edited)