Re: [racket-users] DrRacket 6.4 error message + a misleading message

2016-04-12 Thread Matthias Felleisen 

WeScheme is perfectly fine for college freshmen. It’s my preference not to run 
in a browser. 


> On Apr 12, 2016, at 12:25 PM, Elena Machkasova  wrote:
> 
> Yes, I am familiar with Marceau's work (at least the published papers), it is 
> very cool. One of very few systematic research-based approaches to error 
> messages. 
> I haven't used WeScheme, might be something to look into (although our target 
> audience is college students and other adult beginners, not middle school). 
> 
> Elena  
> 
> On Tue, Apr 12, 2016 at 11:13 AM, Matthias Felleisen  > wrote:
> 
> Yes, all of our releases are always announced.
> 
> If you are studying error messages, please check out Guillaume Marceau’s 
> work, supervised by Kathi Fisler and co-advised by Shriram Krishnamurthi. He 
> worked out an even better version of his ideas for WeScheme, which is still 
> the starting point for Bootstrap, our educational spin-off project for middle 
> schools. 
> 
> — Matthias
> 
> 
> 
> 
> 
>> On Apr 12, 2016, at 11:58 AM, Elena Machkasova > > wrote:
>> 
>> Sounds good, thanks! Will the new release be announced? We are looking at 
>> error messages as a part of a research project, so it would be good to use 
>> the new one if we can. 
>> 
>> Elena 
>> 
>> On Tue, Apr 12, 2016 at 10:53 AM, Matthias Felleisen > > wrote:
>> 
>> Thanks, I have pushed a fix and additional tests for error messages. This 
>> will be included with the next release, to appear in a couple of weeks. — 
>> Matthias
>> 
>> 
>> 
>> 
>> > On Apr 11, 2016, at 9:25 PM, Elena Machkasova > > > wrote:
>> >
>> > Hi All,
>> >
>> > we have discovered that in 6.4 DrRacket (Advanced Student) seems to have a 
>> > bug generating error messages for foldl/foldr:
>> >
>> > (foldl + (list 2 3 4) 0)
>> >
>> > gives an error message "foldl: 2th argument must be a list, given 0"
>> > (in addition to the incorrect "th" for "2nd", the 0 is actually the third 
>> > argument, not second).
>> >
>> > There is also a somewhat misleading error (for beginners) in 6.4 and 
>> > earlier versions, shown with a somewhat artificial example:
>> >
>> > (map (lambda (x y) (+ x y)) (list 2 3 4))
>> >
>> > gives and error:
>> >
>> > the given procedure's expected number of arguments does not match
>> > the given number of lists
>> >  given procedure: #
>> >  expected: 2
>> >  given: 1
>> >
>> > This is technically correct, but not understandable to a student since 
>> > most likely they mistakenly used a two-argument function instead of a 
>> > one-argument one. In fact, students are never shown a map with multiple 
>> > lists. A better message would say that a one-argument function was 
>> > expected, but a two-argument function was given.
>> >
>> > The second error is somewhat of a design choice, but the first one (with 
>> > foldl) is a bug. If there is a way to patch it in 6.4, that would be 
>> > greatly appreciated.
>> >
>> > Cheers,
>> > Elena
>> >
>> >
>> > --
>> > 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 racket-users+unsubscr...@googlegroups.com 
>> > .
>> > For more options, visit https://groups.google.com/d/optout 
>> > .
>> 
>> 
>> 
>> 
>> -- 
>> Dr. Elena Machkasova
>> Associate Professor of Computer Science
>> Division of Science and Mathematics
>> University of Minnesota, Morris
>> Office: Sci 2325
>> (320) 589-6308 
>> http://cda.morris.umn.edu/~elenam/ 
>> 
> 
> 
> 
> 
> -- 
> Dr. Elena Machkasova
> Associate Professor of Computer Science
> Division of Science and Mathematics
> University of Minnesota, Morris
> Office: Sci 2325
> (320) 589-6308
> http://cda.morris.umn.edu/~elenam/ 
> 

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Re: [racket-users] DrRacket 6.4 error message + a misleading message

2016-04-12 Thread Elena Machkasova 
Yes, I am familiar with Marceau's work (at least the published papers), it
is very cool. One of very few systematic research-based approaches to error
messages.
I haven't used WeScheme, might be something to look into (although our
target audience is college students and other adult beginners, not middle
school).

Elena

On Tue, Apr 12, 2016 at 11:13 AM, Matthias Felleisen 
wrote:

>
> Yes, all of our releases are always announced.
>
> If you are studying error messages, please check out Guillaume Marceau’s
> work, supervised by Kathi Fisler and co-advised by Shriram Krishnamurthi.
> He worked out an even better version of his ideas for WeScheme, which is
> still the starting point for Bootstrap, our educational spin-off project
> for middle schools.
>
> — Matthias
>
>
>
>
>
> On Apr 12, 2016, at 11:58 AM, Elena Machkasova 
> wrote:
>
> Sounds good, thanks! Will the new release be announced? We are looking at
> error messages as a part of a research project, so it would be good to use
> the new one if we can.
>
> Elena
>
> On Tue, Apr 12, 2016 at 10:53 AM, Matthias Felleisen  > wrote:
>
>>
>> Thanks, I have pushed a fix and additional tests for error messages. This
>> will be included with the next release, to appear in a couple of weeks. —
>> Matthias
>>
>>
>>
>>
>> > On Apr 11, 2016, at 9:25 PM, Elena Machkasova 
>> wrote:
>> >
>> > Hi All,
>> >
>> > we have discovered that in 6.4 DrRacket (Advanced Student) seems to
>> have a bug generating error messages for foldl/foldr:
>> >
>> > (foldl + (list 2 3 4) 0)
>> >
>> > gives an error message "foldl: 2th argument must be a list, given 0"
>> > (in addition to the incorrect "th" for "2nd", the 0 is actually the
>> third argument, not second).
>> >
>> > There is also a somewhat misleading error (for beginners) in 6.4 and
>> earlier versions, shown with a somewhat artificial example:
>> >
>> > (map (lambda (x y) (+ x y)) (list 2 3 4))
>> >
>> > gives and error:
>> >
>> > the given procedure's expected number of arguments does not match
>> > the given number of lists
>> >  given procedure: #
>> >  expected: 2
>> >  given: 1
>> >
>> > This is technically correct, but not understandable to a student since
>> most likely they mistakenly used a two-argument function instead of a
>> one-argument one. In fact, students are never shown a map with multiple
>> lists. A better message would say that a one-argument function was
>> expected, but a two-argument function was given.
>> >
>> > The second error is somewhat of a design choice, but the first one
>> (with foldl) is a bug. If there is a way to patch it in 6.4, that would be
>> greatly appreciated.
>> >
>> > Cheers,
>> > Elena
>> >
>> >
>> > --
>> > 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 racket-users+unsubscr...@googlegroups.com.
>> > For more options, visit https://groups.google.com/d/optout.
>>
>>
>
>
> --
> Dr. Elena Machkasova
> Associate Professor of Computer Science
> Division of Science and Mathematics
> University of Minnesota, Morris
> Office: Sci 2325
> (320) 589-6308
> http://cda.morris.umn.edu/~elenam/
>
>
>


-- 
Dr. Elena Machkasova
Associate Professor of Computer Science
Division of Science and Mathematics
University of Minnesota, Morris
Office: Sci 2325
(320) 589-6308
http://cda.morris.umn.edu/~elenam/

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Re: [racket-users] DrRacket 6.4 error message + a misleading message

2016-04-12 Thread Matthias Felleisen 

Yes, all of our releases are always announced.

If you are studying error messages, please check out Guillaume Marceau’s work, 
supervised by Kathi Fisler and co-advised by Shriram Krishnamurthi. He worked 
out an even better version of his ideas for WeScheme, which is still the 
starting point for Bootstrap, our educational spin-off project for middle 
schools. 

— Matthias





> On Apr 12, 2016, at 11:58 AM, Elena Machkasova  wrote:
> 
> Sounds good, thanks! Will the new release be announced? We are looking at 
> error messages as a part of a research project, so it would be good to use 
> the new one if we can. 
> 
> Elena 
> 
> On Tue, Apr 12, 2016 at 10:53 AM, Matthias Felleisen  > wrote:
> 
> Thanks, I have pushed a fix and additional tests for error messages. This 
> will be included with the next release, to appear in a couple of weeks. — 
> Matthias
> 
> 
> 
> 
> > On Apr 11, 2016, at 9:25 PM, Elena Machkasova  > > wrote:
> >
> > Hi All,
> >
> > we have discovered that in 6.4 DrRacket (Advanced Student) seems to have a 
> > bug generating error messages for foldl/foldr:
> >
> > (foldl + (list 2 3 4) 0)
> >
> > gives an error message "foldl: 2th argument must be a list, given 0"
> > (in addition to the incorrect "th" for "2nd", the 0 is actually the third 
> > argument, not second).
> >
> > There is also a somewhat misleading error (for beginners) in 6.4 and 
> > earlier versions, shown with a somewhat artificial example:
> >
> > (map (lambda (x y) (+ x y)) (list 2 3 4))
> >
> > gives and error:
> >
> > the given procedure's expected number of arguments does not match
> > the given number of lists
> >  given procedure: #
> >  expected: 2
> >  given: 1
> >
> > This is technically correct, but not understandable to a student since most 
> > likely they mistakenly used a two-argument function instead of a 
> > one-argument one. In fact, students are never shown a map with multiple 
> > lists. A better message would say that a one-argument function was 
> > expected, but a two-argument function was given.
> >
> > The second error is somewhat of a design choice, but the first one (with 
> > foldl) is a bug. If there is a way to patch it in 6.4, that would be 
> > greatly appreciated.
> >
> > Cheers,
> > Elena
> >
> >
> > --
> > 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 racket-users+unsubscr...@googlegroups.com 
> > .
> > For more options, visit https://groups.google.com/d/optout 
> > .
> 
> 
> 
> 
> -- 
> Dr. Elena Machkasova
> Associate Professor of Computer Science
> Division of Science and Mathematics
> University of Minnesota, Morris
> Office: Sci 2325
> (320) 589-6308
> http://cda.morris.umn.edu/~elenam/ 
> 

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Re: [racket-users] DrRacket 6.4 error message + a misleading message

2016-04-12 Thread Elena Machkasova 
Sounds good, thanks! Will the new release be announced? We are looking at
error messages as a part of a research project, so it would be good to use
the new one if we can.

Elena

On Tue, Apr 12, 2016 at 10:53 AM, Matthias Felleisen 
wrote:

>
> Thanks, I have pushed a fix and additional tests for error messages. This
> will be included with the next release, to appear in a couple of weeks. —
> Matthias
>
>
>
>
> > On Apr 11, 2016, at 9:25 PM, Elena Machkasova 
> wrote:
> >
> > Hi All,
> >
> > we have discovered that in 6.4 DrRacket (Advanced Student) seems to have
> a bug generating error messages for foldl/foldr:
> >
> > (foldl + (list 2 3 4) 0)
> >
> > gives an error message "foldl: 2th argument must be a list, given 0"
> > (in addition to the incorrect "th" for "2nd", the 0 is actually the
> third argument, not second).
> >
> > There is also a somewhat misleading error (for beginners) in 6.4 and
> earlier versions, shown with a somewhat artificial example:
> >
> > (map (lambda (x y) (+ x y)) (list 2 3 4))
> >
> > gives and error:
> >
> > the given procedure's expected number of arguments does not match
> > the given number of lists
> >  given procedure: #
> >  expected: 2
> >  given: 1
> >
> > This is technically correct, but not understandable to a student since
> most likely they mistakenly used a two-argument function instead of a
> one-argument one. In fact, students are never shown a map with multiple
> lists. A better message would say that a one-argument function was
> expected, but a two-argument function was given.
> >
> > The second error is somewhat of a design choice, but the first one (with
> foldl) is a bug. If there is a way to patch it in 6.4, that would be
> greatly appreciated.
> >
> > Cheers,
> > Elena
> >
> >
> > --
> > 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 racket-users+unsubscr...@googlegroups.com.
> > For more options, visit https://groups.google.com/d/optout.
>
>


-- 
Dr. Elena Machkasova
Associate Professor of Computer Science
Division of Science and Mathematics
University of Minnesota, Morris
Office: Sci 2325
(320) 589-6308
http://cda.morris.umn.edu/~elenam/

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Re: [racket-users] DrRacket 6.4 error message + a misleading message

2016-04-12 Thread Matthias Felleisen 

Thanks, I have pushed a fix and additional tests for error messages. This will 
be included with the next release, to appear in a couple of weeks. — Matthias




> On Apr 11, 2016, at 9:25 PM, Elena Machkasova  wrote:
> 
> Hi All, 
> 
> we have discovered that in 6.4 DrRacket (Advanced Student) seems to have a 
> bug generating error messages for foldl/foldr:
> 
> (foldl + (list 2 3 4) 0) 
> 
> gives an error message "foldl: 2th argument must be a list, given 0" 
> (in addition to the incorrect "th" for "2nd", the 0 is actually the third 
> argument, not second). 
> 
> There is also a somewhat misleading error (for beginners) in 6.4 and earlier 
> versions, shown with a somewhat artificial example: 
> 
> (map (lambda (x y) (+ x y)) (list 2 3 4))
> 
> gives and error:
> 
> the given procedure's expected number of arguments does not match
> the given number of lists
>  given procedure: #
>  expected: 2
>  given: 1 
> 
> This is technically correct, but not understandable to a student since most 
> likely they mistakenly used a two-argument function instead of a one-argument 
> one. In fact, students are never shown a map with multiple lists. A better 
> message would say that a one-argument function was expected, but a 
> two-argument function was given. 
> 
> The second error is somewhat of a design choice, but the first one (with 
> foldl) is a bug. If there is a way to patch it in 6.4, that would be greatly 
> appreciated. 
> 
> Cheers,
> Elena
> 
> 
> -- 
> 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 racket-users+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

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Re: [racket-users] DrRacket 6.4 error message + a misleading message

2016-04-11 Thread Matthias Felleisen 

Thanks for the bug report. I can confirm the error, and I will check into it 
tomorrow morning. 




> On Apr 11, 2016, at 9:25 PM, Elena Machkasova  wrote:
> 
> Hi All, 
> 
> we have discovered that in 6.4 DrRacket (Advanced Student) seems to have a 
> bug generating error messages for foldl/foldr:
> 
> (foldl + (list 2 3 4) 0) 
> 
> gives an error message "foldl: 2th argument must be a list, given 0" 
> (in addition to the incorrect "th" for "2nd", the 0 is actually the third 
> argument, not second). 
> 
> There is also a somewhat misleading error (for beginners) in 6.4 and earlier 
> versions, shown with a somewhat artificial example: 
> 
> (map (lambda (x y) (+ x y)) (list 2 3 4))
> 
> gives and error:
> 
> the given procedure's expected number of arguments does not match
> the given number of lists
>  given procedure: #
>  expected: 2
>  given: 1 
> 
> This is technically correct, but not understandable to a student since most 
> likely they mistakenly used a two-argument function instead of a one-argument 
> one. In fact, students are never shown a map with multiple lists. A better 
> message would say that a one-argument function was expected, but a 
> two-argument function was given. 
> 
> The second error is somewhat of a design choice, but the first one (with 
> foldl) is a bug. If there is a way to patch it in 6.4, that would be greatly 
> appreciated. 
> 
> Cheers,
> Elena
> 
> 
> -- 
> 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 racket-users+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

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