y_unique doesn't work with stock

[Zorono]

y_unique doesn't work with stock(function)
like

#define hook:%0(%1) \
            static stock UNIQUE_FUNCTION<zHF%0@...>() { \
                print("some code..."); \
            }

the function is not declared anyway (i checked the macros of the .amx many times and used funcidx)
please note that when i used public/forward instead of stock it worked perfectly
any idea please ???