jextract/jni: Add support for returning protocols#814
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Adds support for returning
any P / some Pfrom a function, variable etc...This is done by generating a
<P>Boxinstance in Java, that makes downcalls by opening the existential and calling a cdecl. This box implements both all protocol requirements and any inherited protocol requirements.One special thing is for
setters, where we need to do a "load-mutate-store", because it might be a value type.Closes #380