| C.Cast (te,ty) -> C.Cast (aux te, aux ty)
| C.Prod (n,s,t) -> C.Prod (n, aux s, aux t)
| C.Lambda (n,s,t) -> C.Lambda (n, aux s, aux t)
| C.Cast (te,ty) -> C.Cast (aux te, aux ty)
| C.Prod (n,s,t) -> C.Prod (n, aux s, aux t)
| C.Lambda (n,s,t) -> C.Lambda (n, aux s, aux t)