Why would an initialised struct pointer field be null in the struct's destructor?

[Adam D. Ruppe via Digitalmars-d-learn]

On Monday, 22 May 2017 at 00:36:24 UTC, Stanislav Blinov wrote:
> I can't think of any case where you'd want preconditions on 
> destructor when the object is in .init state.

I think we're actually saying the same thing: I mean the 
destructor must be callable on .init so you might do like

struct Foo {
    int* ptr;
    ~this() {
       // might be called with ptr is null cuz of .init
       // so wanna check
       if(ptr !is null) free(ptr);
     }
}