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Small typo fix in Chapter 11
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@ -3138,7 +3138,7 @@ Thus, in any execution state, we can ``kill time'' by running garbage collection
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More precisely, the limit on how many times we can run garbage collection in a row, starting from heap $h$, is $|\dom{h}|$, the number of locations in $h$.
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The type-safety proof is fairly straightforward to update.
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We prove progress by \emph{ignoring} the garbage-collection rule, since the existing rule was already enough to find a step for every nonvalue.
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We prove progress by \emph{ignoring} the garbage-collection rule, since the existing rules were already enough to find a step for every nonvalue.
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A bit more work is needed to update the proof of preservation; its case for the existing rules follows the same way as before, while we must prove a few lemmas on the way to handling the new rule.
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\begin{lemma}[Transitivity for reachability]
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