I just merged Paolo's fix. The fix should be in the next release. If you want to try it before that, you can either try building from source, or using a nightly build tomorrow: pre.racket-lang.org
Vincent On Thu, 10 Dec 2015 12:44:39 -0600, Paolo Giarrusso wrote: > > On Thursday, December 10, 2015 at 7:15:07 PM UTC+1, Jonathan Brachthäuser > wrote: > > In DrRacket 6.2.1 when using the `match` construct as defined in the > > abstraction teachpack together with posn a strange problem appears. > > > > When choosing BSL as language the following code just works as expected: > > > > ``` > > (require 2htdp/abstraction) > > (match (make-posn 1 2) [(posn x y) (+ x y)]) > > ``` > > > > yields `3`. > > > > However when choosing "BSL with list abbreviation" the above code gives: > > > > ``` > > ... (posn x y) ... > > function call: expected a function after the open parenthesis, but found a > > part > > ``` > > > > We can work around the error by using `my-posn` instead (defined below) > > > > ``` > > (define-struct my-posn (x y)) > > ``` > > > > Is there any explanation why this happens? Is the abstraction teachpack not > > designed to work with "BSL with list abbrv" ? > > The issue is a missing export in BSL+. > > Last time this came up, I submitted a pull request which is still open, so I > suspect this isn't fixed yet: https://github.com/racket/htdp/pull/16. > Apparently I only made a pull request and didn't open a thread on this ML, > which might be part of the problem. > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
