I have improved the error message.
-- 
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel  
http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
> On Mar 9, 2016, at 4:18 PM, Johan Fabry 
jfabry@dcc.uchile.cl wrote:
> 
> Hola,
> 
> in part of the code of LRP I work with arrows, and I need to get the shape, but this triggers a DNU. I guess I need to set something on the arrow before I can get the element, or get it via another route. What should I do?
> 
> Relevant code below:
> 
> arrow := RTArrowedLine new
> 		color: trans color;
> 		edgeFrom: efrom to: eto;
> 		withOffsetIfMultiple.
> element := arrow element.
> 
> Gives me:
> 
> RTElement(Object)>>doesNotUnderstand: #to
> RTShorterDistanceWithOffsetAttachPoint(RTAbstractShorterDistanceAttachPoint)>>basicStartingPointOf:
> RTShorterDistanceWithOffsetAttachPoint>>basicStartingPointOf:
> RTShorterDistanceWithOffsetAttachPoint(RTAttachPoint)>>startingPointOf:
> RTLine(RTAbstractLine)>>updateFor:trachelShape:
> RTLine(RTShape)>>trachelShapeFor:
> RTArrowedLine>>trachelShapeFor:
> RTElement(RTShapedObject)>>addShape:
> RTArrowedLine(RTShape)>>element
> LRPProgramVisualization>>buildTransition:withElements:forView:
> 
> 
> ---> Save our in-boxes! 
http://emailcharter.org <---
> 
> Johan Fabry   -   
http://pleiad.cl/~jfabry
> PLEIAD and RyCh labs  -  Computer Science Department (DCC)  -  University of Chile
> 
> _______________________________________________
> Moose-dev mailing list
> Moose-dev@list.inf.unibe.ch
> 
https://www.list.inf.unibe.ch/listinfo/moose-dev