Hi,

On Tue, Apr 16, 2013 at 9:01 AM, Urs Liska <li...@ursliska.de> wrote:

> Am 16.04.2013 14:07, schrieb Richard Shann:
>
>  On Tue, 2013-03-26 at 10:29 +0100, Urs Liska wrote:
>>
>>> BTW we're preparing the release of a LilyPond toolbox library (where
>>> \displayControlPoints will be included of course), and I'd love to
>>> include this new one there too.
>>>
>>>  I've been trying to track down where this code might be - the last email
>> in the thread
>> http://www.mail-archive.com/**bug-lilyp...@gnu.org/msg34439.**html<http://www.mail-archive.com/bug-lilypond@gnu.org/msg34439.html>
>>   ends with a snippet which fails on execution
>>
>> Drawing systems...test.ly:28:6: In procedure memoization in expression
>> (if (eq? line #t) (begin #) ...):
>> test.ly:28:6: In file "test.ly", line 27: Missing or extra expression in
>> (if (eq? line #t) (begin (ly:stencil-add (make-line-stencil 0.05 (car
>> (first cps)) (cdr (first cps)) (car (second cps)) (cdr (second cps)))
>> cps)) (car (third cps)) (cdr (third cps))).
>>
>> this is with 2.16.2
>>
>> Richard Shann
>>
>>
>>  I can't tell this right now, but it may very well be that this is due to
> syntax changes after 2.16.
> The code which we use (with 2.17.3) is still in our private library.
> When we will (hopefully soon) work on transfering stuff to the new public
> location we'll surely review these functions again and may also find
> solutions to work with different LilyPond versions.
> You can see a screenshot here http://a.fsdn.com/con/app/**
> proj/openlilylib/screenshots/**OLLib-ctrl-pts-colors.png<http://a.fsdn.com/con/app/proj/openlilylib/screenshots/OLLib-ctrl-pts-colors.png>in
>  the meantime. I'm sure it would fit very well to your endeavours
> (judging from the latest video).
>
> Urs
>

When I recently cut-and-pasted the code from the email, I had this same
problem.  IIRC, the only problem was that a long comment line had been
broken across lines.  Just add the semicolon to the beginning of the added
line and all should be well.

HTH,
David
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