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I made an example of what Im trying to do.

https://goplay.tools/snippet/Vj7uVMi0mWn

Basically have two different types that implement an interface, pass them into a receiver function in a composite type (array,slice).

Part of the issue is that you cant have the receiver function without defining instantiating the type on the receiver Spotter in this case.

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You don't actually have to instantiate the type for a receiver function (i.e., method). There's too much missing from your code for me to understand which direction you're going but you'll likely have to use a constraint for structs which is explained here: https://github.com/akutz/go-generics-the-hard-way/blob/main/...

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