Sergei Egorov <xxxxxx@acm.org> writes:

> Would it be reasonable to suggest, as a part of R7RS Large process, to
> explicitly specify a superset of R7RS Small (we may informally call it R7RS
> Medium) having just enough extra primitives and mechanisms to allow for
> practical R7RS Large reference implementation to be distributed as a portable
> set of R7RS Medium-based libraries, with minimal cond-expand tricks?
>
> This would allow small Scheme implementors to partake in R7RS Large game with
> reasonable additional effort.

I think this is the purpose of having the "Foundations" sections of
R7RS-large, as opposed to the "Batteries" sections, which can be built
on top.