macros question

[Andrew Arro]

so, we have built-in __FILE__ and __LINE__

how could we define
__FILELINE__ macros so it would be smth like, for example, "file.c:11"

i've tried
#define __FILELINE__ __FILE__ ## ":" ## __LINE__
and
#define __FILELINE__ __FILE__ ## ":" ## #__LINE__

and a bunch of different combinations but none work for me :(