Michael Montague scripsit: > I suggest that immutable pairs should use the same names (cons, car, > cdr, pair?, etc) as mutable pairs. A programmer can control which > implementation of pairs they use in a particular module using import.
That's exactly what I thought when I started this effort, but after all, some Schemes don't have modules, so I figured I'd just go with the minimal name changes. So I wrote a script to refactor all the names in the code (a few names of local variables got missed, I think), wrote a bunch of tests, and started debugging. I figured it would be a doddle. Only not. What I wasn't thinking of was that the mechanism of procedures with arbitrary numbers of arguments, of which SRFI-1 and SRFI-116 have many, involves the use of lists, not ilists. In Racket, ordinary Scheme lists were immutable and there was no problem. But to make the code work in Chicken and Chibi, where I do most of my development, I had to scrutinize all of the converted code for map and for-each and many other routines in order to decide when I was dealing with immutable lists and when with mutable argument lists. > Issue (2) could be solved by factoring (scheme base) into pieces: > (scheme base pairs), (scheme base strings), etc. Actually, there is nothing magic about (scheme base) except that it's loaded by default in the REPL. Chibi allows you to start a REPL with an arbitrary base package, so it would be no problem to create (scheme ilist base) and (scheme ilist list) to provide the base library and SRFI-1 respectively, but with immutable pairs. But if you want to deal with arbitrary numbers of arguments, you'd still have to have the mutable-pair operations available with prefixes. -- John Cowan http://www.ccil.org/~cowan co...@ccil.org Schlingt dreifach einen Kreis vom dies! Schliesst euer Aug vor heiliger Schau, Denn er genoss vom Honig-Tau, Und trank die Milch vom Paradies. _______________________________________________ Scheme-reports mailing list Scheme-reports@scheme-reports.org http://lists.scheme-reports.org/cgi-bin/mailman/listinfo/scheme-reports
