Re: srfi-0 and srfi-7

Thanks for the response.

> Neil> 3. Are SRFI-0/7 feature names for MzScheme-specific extensions defined?
> Neil>    I don't see any in "features.ss".
> 
> No, and for good reason.

I can only guess at the guiding philosophy; could you elaborate?

There are non-SRFI features that my portable code needs to talk about.

For example, my current code has to know which of a few TCP APIs to use,
and the most pragmatic way is to talk about features such as "Scsh Posix
sockets API," (supported by not just Scsh) and "MzScheme 200 (supported
to some extent under Gauche).

Also, there are cases like Scsh and Scheme48 declining to provide an
R5RS-compliant "integer->char".  So I need a way of talking about
how to get "ascii->char" behavior.

And sometimes I just want to know which implementation I'm running on,
since I have a priori information about particular ways to do things on
that implementation for big wins or to work at all.  In fact, this is
probably what I need most often: "If we're using Foo Scheme, then do
THIS.  If Bar Scheme, then THAT.  If neither of those, but the
implementation supports a Baz API, then do THOSE THINGS.  If all else
fails, use THESE criminally inefficient R5RS-based procedures."


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