Generated 'from' method has trouble with parameterized interfaces that declare properties about immutables HOT 2 OPEN

It may be a little bit weird, so what it does, it consider each supertype and then the same type and uses runtime bits to avoid pulling things already set. It doesn't do good analysis of what properties subtypes are covered and which are not (again - runtime check). And I don't remember for sure, but we're probably skipping supertypes with Generic parameters to avoid unsoundness/heap pollution. In the given example, it seems clear that the check like if (object instanceof LastModified<?>) and pulling lastModified() should be fine (as no type parameters used on this accessor). So maybe this can be fixed, given that generic will be properly handled (i.e. allow only wildcard like from(LastModified<?> ) and only using attributes with no type parameter used in return type). I guess this seemed a bit not trivial, so were originally omitted. I'll revisit this part to see how hard it will be to improve the handling, but it will take time

from immutables.

Thanks so much for looking at this. In the meantime, we refactored our code to avoid this specific problem, so we are not in a rush to get it fixed. But it feels like a pitfall other users might run into as well, even if it is a bit of an edge case.

from immutables.