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> I read http://www.lua.org/manual/5.3/manual.html#lua_pushcfunction
> 
> ---
> lua_pushcfunction is defined as a macro:
> 
>      #define lua_pushcfunction(L,f)  lua_pushcclosure(L,f,0)
> 
> Note that f is used twice.
> ----
> 
> Why f is used twice ? I saw only once.

Sure! Thanks for the feedback.

-- Roberto