An engineer designs a compiler for a formal language. Which consequence follows if the language requires unbounded lookahead during parsing?

💡 Explanation

Unbounded lookahead in parsing means the compiler must potentially examine an unlimited amount of future input to determine the correct parse tree; this necessitates Turing-complete computation to handle the unbounded search space, because pushdown automata are insufficient. Therefore, a Turing-complete machine is needed, rather than a simpler machine, under this condition.

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