>>47
I was just trying to say that there are actually very few incompatibilities between R7RS and R6RS. Most of the difference and advantage is in strictly defined semantics of R6RS which are compatible with the loosely defined semantics of R7RS. There are some differences which are significant like the exception system, and syntax-case, but for the most an implementation of R7RS can give you almost all of the benefits of R6RS. There is hope that R7RS Large will even allow for the expression of these remaining features of R6RS. This is the approach of Larceny and Sagittarius in any case (Larceny implement R7RS Red Edition as well).