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In Smalltalk methods, local variables act as though they were parameters
with nil values. However, although you can change the value of a
local variable using an assignment statement, you cannot change the value
of a parameter using an assignment statement. For example, you
cannot amend the convertToCaloriesWith: method, defined in
Segment 121, as follows:
Integer method definition • instance convertToCaloriesWith: x "The following assignment statement does not work" x := self * x. ^ x