How to resolve "Use of protocol 'View' as a type must be written 'any View'" in some cases

MakeViewsInSwiftUI.swift

// MARK: - Bad: "Use of protocol 'View' as a type must be written 'any View'"

struct LeftRightView: View {
    let leftView: View
    let rightView: View

    var body: some View {
        HStack {
            leftView
            rightView
        }
    }
}

// MARK: - Good

struct LeftRightView2<Content: View>: View {
    let leftView: Content
    let rightView: Content

    var body: some View {
        HStack {
            leftView
            rightView
        }
    }
}

Also see this SO question.