Executable XML users challenge

provide any LISP macro with clear explanation of its structure and function
that is :
1.concise (max 10 lines)
2.does not have a C equivalent(at least not anything above 100 lines)
3.does not use any libraries or imported complex functions which are not in C
If you provide an exact explanation/commentary on what it does i'll try to make a C solution which
is equivalent to LISP one. If i fail to do so, LISP wins, if i provide a solution you can make another macro.
If all examples in the thread are provide with C equivalents, LISP loses.

>>241
It's frozenvoId , what were you expecting? Someone that actually knew how to program? Based on previous posts in different threads it's clear he doesn't even know the C standard let alone how certain things work.

the moron didn't even know what actually happens when you malloc(-#)