On 4/1/09, Michael van der Gulik mikevdg@gmail.com wrote:

On 4/1/09, Ray Feliciano ray.feliciano@hotmail.com wrote:

...

Hi there,

New to Squeak and the mailing list. Just had a question was hoping someone could answer. I'm currently following the Laser Game Development Example by Stephen Wessels and have hit a road block. I'm using Squeak image 3.10.2-7179-basic.

Tutorial Link: http://squeak.preeminent.org/tut2007/html/ Step I'm On: http://squeak.preeminent.org/tut2007/html/028.html

I've gone back and checked to make sure I had all the code written the same way, in the same places (I didn't at first) but 4 sUnit tests wont pass for the MirrorCellTestCase. I get Error: only integers should be used as indices. Now, going through the debugger I notice the error happens when my MirrorCell "cell" hits the code: 'self exitSides at: #north put: #east.'

I'm guessing this should be a number. Yet, since I'm new to Squeaking and trying to follow along, I don't want to mess anything up that may affect later portions of the tut. Any ideas, suggestions, comments?

No, it shouldn't be a number. I've just had a quick look at the tutorial (never looked at it before).

I suspect "self exitSides" is returning "nil" rather than a Dictionary like it should. When you call >>at:put: like you did on a nil, you get the error you got. Personally, I think this is a bug in Squeak; the error is very misleading.

Umm... the fix is obvious for an experienced Smalltalker but a little non-trivial to walk through using email. Jump on IRC and ask me there:

er... except that I can't connect to IRC right now :-(.

Gulik.