Discussion
A one table implementation of nested scopes handles block entry and exit by
Answer: A
Correct answer: pushing entries onto a stack and popping them when the block ends
A single table organised as a stack matches the nesting exactly: entering a block records a mark, declarations are pushed above it, and leaving the block pops back to the mark. Lookup searches from the top down, so the innermost declaration is found first - which is precisely the scoping rule.
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