Hi

ImageSegment discoverActiveClasses.
is cool and it lets you (by swapping method dict behind your back) knowing which classes
have been involved in a certain action.

as follow
Now ImageSegment discoverActiveClasses.
-- do something typical --
ImageSegment activeClasses size printString , ' classes were active out of ' ,
Smalltalk allClasses size printString.

Now if following
recoverFromMDFaultWithTrace

you put

Smalltalk at: #MDFaultDict put: Dictionary new.

you get a strange error, tell you that there is syntax error

Stef