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Now, suppose that you evaluate the fragments shown in Segment 794 and
Segment 795 in a workspace, and then you send a change message to the
model. Specifically, you send a changed: message to the model with,
say, #test as the argument:
Workspace
M := ModelSubclass new.
V := ViewSubclass new.
V model: M.
M changed: #test.
Because the model receives a changed: message, the model sends an
update: message to all dependent parts, one viewer in the example,
with #test as the argument. Because the View class defines
update: to do nothing in such circumstances, nothing seems to
happen.