clone method of Object

[grauzone]

> There are two things on my side:
> 1. Compiler refuses to clone private attributes. I have tried
> gdc/gdmd/dmd_v1 in Linux.

It was changed in dmd later, and now you can access private attributes 
by using tupleof. I don't know when exactly it was changed, but it 
should work at least with dmd 1.039 and later. GDC probably uses an 
ancient front-end version, and I think nobody should use it.