Why is the constructor of B called?

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

On Wednesday, 23 September 2015 at 21:08:37 UTC, tcak wrote:
> I wouldn't expect B's constructor to be called at all unless 
> "super" is used there.

"If no call to constructors via this or super appear in a 
constructor, and the base class has a constructor, a call to 
super() is inserted at the beginning of the constructor. "


from http://dlang.org/class.html#constructors

the idea is to make sure the base class construction work is done 
too.