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kotlinlang

I wrote my own extension function for `sumOf` on `Iterable` for my own numeric-ish type.  but I'm unsure on where to put it. If I put it in the file that calls `sumeOf` it works, but if I put my impl in the file where my type is (which is where I think it should live), the compiler can't find it. Is there some magic to tell the compiler where the impl is?

if I add a explicate import for the sumOf function, it works if I put it w/ my impl. The compiler can't just find it in the name-space?

yeah, you need to import extension functions, if they are in different file

there's no C++-like ADL in Kotlin, nor any other language I know of