Discussion
A mid-rule action in Yacc is implemented by
Answer: D
Correct answer: introducing an anonymous nonterminal deriving epsilon
An action in the middle of a rule needs a reduction to trigger it, so the generator invents a nonterminal deriving nothing, places it at that point, and attaches the action to its reduction. The cost is that this extra nonterminal can introduce conflicts into a grammar that was otherwise clean.
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