Why does nobody seem to think that `null` is a serious problem in D?

[Alex]

On Wednesday, 21 November 2018 at 14:21:44 UTC, Kagamin wrote:
>
> A value passed to ref parameter is assumed to be initialized. 
> C# would reject to call function foo.

This was not my point. I wonder, whether the case, where the 
compiler can't figure out the initialization state of an object 
is so hard to construct.

´´´
import std.experimental.all;

class C
{
	size_t dummy;
	final void baz()
	{
		if(this is null)
		{
			writeln(42);
		}
		else
		{
			writeln(dummy);
		}
	}
}
void main()
{
	C c;
	if(uniform01 < 0.5)
	{
		c = new C();
		c.dummy = unpredictableSeed;
	}
         else
         {
                 c = null;
         }
	c.baz;
	writeln(c is null);
}
´´´

C# wouldn't reject the case above, would it?