Discussion
Consider the following statements about symbol table scope handling.
1. A duplicate check must look only in the current scope.
2. A use lookup must follow the chain of enclosing scopes.
3. Both operations must search every scope in the program.
Answer: B
The two operations differ precisely in how far they search. Requiring the duplicate check to search outward would wrongly reject any legitimate shadowing declaration. Almost every block structured program relies on shadowing somewhere.
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