Problem setting a breakpoint in the last line of a method (in 7.4)

> -----Original Message-----
> From: Sonia Chase [mailto:[hidden email]]
> Sent: Wednesday, April 18, 2007 6:01 PM
> To: [hidden email]; [hidden email]
> Subject: Problem setting a breakpoint in the last line of a method (in
> 7.4)
>
> We are seeing a walkback, "Unhandled exception: Subscript out of
> bounds", when trying to set a breakpoint in the last line of a method
> similar to this one:
>
> someMethod
>    true
>        ifTrue: [
>            true
>                ifTrue: [String new]]
>
> The problem happens when setting the breakpoint, not during execution of
> the method so it is easy to reproduce.  We kept taking things out of our
> method that we originally found the problem in until we could reproduce
> the problem in a 7.4 visual.im image with the code we have above.  Yes,
> this code is meaningless, but in its simplicity it showcases the problem
> without distractions.
>
> If you add a period to the end of the method and then another line of
> code, then the problem goes away.   A period by itself is not enough.
> Adding another line of code within the second ifTrue: block doesn't have
> any effect on the situation.
>
> someMethod2
>    true
>        ifTrue: [
>            true
>                ifTrue: [String new]].
>    self halt.
>
> If you make the modification to add the self halt at the end, then you
> can set a breakpoint in the 'String new' line.   After successfully
> setting that breakpoint, try setting another one anywhere in the
> method.   Now you will get an "Unhandled exception: Message not
> understood: #first".   This is probably just a side effect of the first
> problem, but I have included it because sometimes a problem can be
> debugged easier from its side effects than from the original walkback.
>
> Regards,
> Sonia Chase
> Adventa Control Technologies, Inc.
> 3001 E. Plano Parkway, #100
> Plano, TX 75074-7422
> Office: 972.543.1688
> FAX: 972.633.9317
> http://www.adventact.com
> mailto:[hidden email] <mailto:[hidden email]>