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> I'm trying to design a "portable" function to determine at run-time
> the implementation (Gambit, Chez-Scheme, Bigloo, etc) that is running
> the code (how's that for a paradox!).
There is something about this that reminds me of:
Anyone who considers arithmetical methods of producing random
digits is, of course, in a state of sin. -- John von Neumann
You could inspect the numeric tower implemented: things like
(exact? (/ 2 3)) and (exact? (fact 100)).
You could test the rules implemented for top-level macro scope (LET,
LET*, etc., to use Clinger's terminology).
You could print a procedure to a file, read it back as text, and see
what syntax it uses.