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This Mini-Scheme Interpreter is based on "SCHEME Interpreter in
Common Lisp" in Appendix of T.Matsuda & K.Saigo, Programming of LISP,
archive No5 (1987) p6 - p42 (published in Japan).
Supported features (or, NOT supported features :-)
1) Lists, symbols, strings.
However, strings have very limited capability.
For instance, there is *NO* string-ref, string-set!, ... etc.
2) Numbers are limited to FIXNUM only.
There is *NO* complex, real, rational and even bignum.
3) Macro feature is supported, though not the one defined in R4RS.
Known problems:
1) Poor error recovery from illegal use of syntax and procedure.
2) Certain procedures do not check its argument type.
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