[racket] match in Advanced Student?

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Wed Aug 17 18:02:58 EDT 2011

Could you just require match into bsl/isl?


On Wednesday, August 17, 2011, Prabhakar Ragde <plragde at uwaterloo.ca> wrote:
> On 8/17/11 10:30 AM, Shriram Krishnamurthi wrote:
>> My experience last year was that the restrictions on some of these
>> sub-forms were arbitrary and not helpful. It also makes it harder for
>> students because if they click on the "wrong" documentation, they
>> don't understand why the thing that the docs say should work doesn't.
> Well, I certainly didn't. The Advanced Student documentation doesn't
really explain `match', so one has to go to the Guide or Reference anyway
(e.g. for quasipatterns). It takes some careful peering at the grammar of
Advanced Student to notice that ASL `match' is restricted, and to figure out
what is permissible.
> I would like to use `and', `or', and `?' patterns, at least. But to do so
I have to take the students into Advanced Student earlier than I want (just
after functional abstraction) and forbid them to use all the `!' functions
and I/O. However, if I'm only going to get a restricted version of `match'
by doing that, I might as well take them into #lang racket.
> Okay, maybe I won't go to that extreme yet. Let me see how far I can get
without full `match'. --PR
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