how to have alias this with an unaccessible member?

[Timothee Cour]

How to have alias this with an unaccessible member (x below).
Making the member private won't work as it'll disable all operations on
said member.

----
struct A(T){
  T x;
  //private T x would prevent alias this from doing anything useful
  alias x this;
}
void main(){
  auto a=A!int;
  a++;//should do a.x++;
  static assert(!__traits(compiles,a.x)); // I want this to hold

}
----
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