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If I have an `expect fun test()` and 1 target, which already has a `fun test() {}` (and doesn't have the `actual` keyword), is that supposed to work, or does `actual` need to be specified?

Technically it can work, although it is not recommended (at least at this moment). Consider moving `expect fun` to another package or different name, and then create its actual by re-using existing fun. If it is too boilerplate-ish and you are okay with lowering compiler safety, then you can declare just expect and suppress warning/error if there is any.

Ok I wasn't sure, because I wasn't getting any errors or warnings. 

However when I changed it to `expect fun test(foo: Bar)` and `fun test(foo: Bar)` I did get a warning