Added copy constructors to "Programming in D"

[Ali Çehreli]

On 1/8/22 5:49 AM, Stanislav Blinov wrote:

 >> Of course, now I stress that postblit is discouraged.
 >
 > Bit early, methinks. Copy ctors aren't even fully supported by the
 > runtime yet.

Thanks. The spec discourages postblit as well. What's the best of saying 
it then? Something like "There are still limitations of copy 
constructors as of this writing." Or there are just bugs?

Ali