DMD 0.177 release

[Walter Bright]

Andrei Alexandrescu (See Website For Email) wrote:
> Classes are different from structs in two essential ways:
> 
> 1. Polymorphism
> 2. Referential semantics
> 
> The two are actually interdependent, as you can't have polymorphism
> comfortably unless you have reference semantics.

That's one of the things I felt in my bones, but was unable to put my 
finger on it.