Scala generics and type mismatch?

The short answer is that your FooProcessor is an extension of ProcessorFoo and is specific to Foo . In DelegatingProcessor you need a Processor that is able to handle not only Foo but any valid Model . FooProcessor simply doesn't fit the bill here.

And — don't try to convince the compiler otherwise, because the compiler is here exactly to prevent this kind of mistakes :-).

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