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When you test programs, you encounter bugs; when you encounter a
Smalltalk bug, you see a walkback window. Suppose, for example, that you
forget to use printString to covert a number into a string before
printing:
Workspace
Transcript show: 1746
.
Smalltalk responds by popping up a walkback window:
You learn about walkback windows and many other debugging aids in Chapter••missing reference••.