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@@ -919,7 +919,7 @@ operation prompts the user of the program for an integer. Recall that
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program \eqref{eq:arith-prog} performs a \key{read} and then subtracts
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\code{8}. So if we run
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\begin{lstlisting}
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-(interp-R0 ast1.1)
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+(interp-R0 (Program '() ast1.1))
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\end{lstlisting}
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and if the input is \code{50}, then we get the answer to life, the
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universe, and everything: \code{42}!\footnote{\emph{The Hitchhiker's
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Onel Harrison