176: Mainline
The scope of a variable is that portion of a program in which that
variable can be evaluated or changed. The local variables in Smalltalk
are locally scoped: those variables are available for evaluation or
assignment in only the method itself.
A variable value assigned in one method cannot interfere with a variable
assignment or parameter assignment in another method, even if the names
are the same.
The value of a variable established in one method cannot be determined
in another method.
