An example default implementation of the Struct typeclass based on GHC.Generics
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I had a few conversations with @fdedden during and after ZuriHack about the possibility of adding instances of the
Structclass for user-defined datatypes with less boilerplate, potentially using Generics.Furthermore, the separate instances of the
Typedclass are no longer necessary if one uses an overlappable instance. (Which is fine, as a type will never be both implementingStructand be one of the other non-struct types at the same time.)I thought this should be possible and not terribly difficult, so as I had a little time this evening I gave it a shot.
This PR is not intended to be merged; it is only example code that should give you an idea of how GHC.Generics could be used to accomplish the desired task.