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>   #define abs_index(L, i) \
> 	((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
> 	lua_gettop(L) + (i) + 1)
> 
>  How about including it into the lauxlib.h or maybe lua.h?

The problem is that it uses `i' several times. For a generic,
"official" macro, this is not too polite.

-- Roberto