casting to structure

[Igor Shirkalin via Digitalmars-d-learn]

On Saturday, 24 June 2017 at 20:43:48 UTC, Igor Shirkalin wrote:
> struct A
> {
>   void * data; // void * type is just for example
>   // no matter what is here
> }

I know that if I add constructor  this(int)

struct A {
	void * p;
	this(int k) { p = cast(void*)k; }
}

auto a = cast(A) 23; // it works

Is it possible without such a constructor?