Ectara, it is not C++ because I am looked to the memory at pointer gived from GetArgAddress (when investigated an original error).. so there is 0xffffffffffffffff in memory prepared by AngelCode engine.
Also, I declared application function as FnTestUint64(asQWORD ui64b) and there is nothing misunderstandable for compiler.
rip-off, thanks, i got idea, so will make my own preprocessing utility. Seems, that in the same way I can solve 3-4 questions.. But, hope AngelScript will be better with this functionality due avoiding to rewrite old C-sources in AS-syntax.