[Rd] S3 dispatch does not work for generics defined inside an environment

[Greg Minshall]

Taras,

> P.S. If you are wondering what I am trying to achieve here — we have a
> very large codebase and I am trying to use environments as a type of
> “poor man’s namespaces” to organize code in a modular fashion. But of
> course it’s all pointless if I can’t get the generics to work
> reliably.

i'm not knowledgeable about S3.  but, a different way to try to
modularize large code bases is to split them into separate packages.
just in case you hadn't already thought about, and rejected, that idea.

cheers, Greg