Just found this mail.. :)
Will take a look tomorrow.
And, if we're speaking about debugger, there are problems with simulating
<primitive: module: error:>
vs
<primitive: module: >

i'm not sure, how good/bad things in squeak,
but in pharo, Mariano modified the code to get rid of many try:with:with..
but still it doesn't handling simulation of primitives with error codes right.

http://code.google.com/p/pharo/issues/detail?id=5459




-- 
Best regards,
Igor Stasenko.