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Of course, the version of
formatWithWidth: defined in Segment 490 crashes in the
event the prescribed width is less than the length of the given string.
Accordingly, you should test the length of the given string, and, if it is
too big, produce a string of the prescribed length filled with *
characters. Filling the field with * characters is the standard way
of informing human readers that you made an attempt to squeeze a too-large
item into a too-narrow space:
String method definition • instance formatWithWidth: w self size <= w ifTrue: [^ ((String new: w - self size) atAllPut: $ ) , self] ifFalse: [^ (String new: w) atAllPut: $*]