Why is NDC::cloneStack() disabled?

[M Sphinct]

Hi, 

I've been searching through the source code and the mailing lists, but I can't
find any reference as to why NDC::cloneStack() and NDC::inherit() are disabled.

The docs reference it, but the code has clearly been commented out.


eg., ndc.h
 //                static Stack * cloneStack();
 //                static void inherit(Stack * stack);

Then it's "if 0"'ed out in ndc.cpp.

Is that functionality going away, or being redesigned?

Thanks,

M