166: fix compilation error in dotty #291
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Fixes #166
This makes dotty compile and it also still compiles for scala 2.13.3.
The problem is that you need to add parenthesis in the ShoppingSchema code. I've refactored out the dotty example from the scala2 example.
To make the dsl like syntax work for scala 3 I think we need to add the @infix annotation, but not sure if this will work with scala 2, so maybe this could be added later if needed?