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diff --git a/TODO b/TODO
index 4e42205..a9b0bd8 100644
--- a/TODO
+++ b/TODO
@@ -4,3 +4,4 @@
 4) Stop copying the entire goal stack into every choicepoint
 5) Stop creating choicepoints when it is not needed
 6) How to implement builtins nicely?
+7) Right now we copy and allocate a lot, but almost never free stuff.
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