leppie scripsit:

> I think more along the lines of:
> 
> 1. define all not implemented procedures/syntax as identifier-syntax, raise 
> an expand time &not-implemented condition on usage

How is this different in actual use from just leaving them undefined?
The point of feature groups is to be able to *introspect* on what your
chosen Scheme can and can't do.

-- 
John Cowan  <[email protected]>  http://ccil.org/~cowan
Micropayment advocates mistakenly believe that efficient allocation of
resources is the purpose of markets.  Efficiency is a byproduct of market
systems, not their goal.  The reasons markets work are not because users
have embraced efficiency but because markets are the best place to allow
users to maximize their preferences, and very often their preferences are
not for conservation of cheap resources.  --Clay Shirkey

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