Would this be a useful construct to add to D? auto for constructor call.

[Chris Katko via Digitalmars-d-announce]

```D
class dataGridLayerView{
   int t;
   this(int _t){
      t = _t;
      }
   }
class myClass{
   dataGridLayerView dataGrid;

   this()
      {
      dataGrid = new auto(15); // <--- new
      // instead of
      dataGrid = new dataGridLayerView(15);
      }
   }
```

Because it seems, conceptually, the compiler should know all the 
details required here to simply insert the right constructor 
name. Basically just the reverse of:

```D
auto t = sqrt(15);
```

So intuitively it makes sense to me.

It might even be possible to write a mixin to do this, I'm not 
sure.

I'm no D wizard, but I don't see any obvious name or lexing 
conflicts/ambiguity.

Cheers,
--Chris