How to prevent nim generate C code access parent type through `Sup` field?

[sls1005]

Maybe you need:
    
    
    type
      Parent {.importc, nodecl.} = object
        x: cint
      Child {.importc, nodecl.} = object
        base: Parent
        y: int
    
    var c: Child
    echo c.base.x
    let p = cast[ptr Parent](addr c)
    
    Run