How can I return some InsettableShape Protocol in SwiftUI

Question

I have a function which returns some InsettableShape like this:

func test(value: Int) -> some InsettableShape {
    
    if (value == 0) {
        return Circle()
    }
    else if (value == 1) {
        return Capsule()
    }
    else {
        return Rectangle()
    }
    
}

Xcode give an error of:

Function declares an opaque return type, but the return statements in its body do not have matching underlying types

because there is a missing ShapeBuilder or InsettableShapeBuilder wrapper, I cannot make this code work, how can I solve this problem?