Fix lambda visitor example #2
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Gof visitor example has been fixed by f1f498d
... but then it leaves a clearly inferior lambda visitor implementation which does not guarantee at compile time that all 3 cases are handled (plus the implementation would not work for generic classes). This guarantee is what make the visitor pattern superior to using
instanceof.Hopefully this can be easily fixed with a little help from https://github.com/derive4j/derive4j (or equivalent manually written code).