$ cat test2.asm
%if 0
%ixdefine repeatdw dw
%else
%imacro repeatdw 1-*.nolist
 %rep %0
        dw %1
  %rotate 1
 %endrep
%endmacro
%endif

repeatdw aa, bb
$ nasm test2.asm
test2.asm:12: error: symbol `aa' not defined
test2.asm:12: error: symbol `bb' not defined
$