a21c29507c
I'm slightly suspicious of this fix -- it seems to work, but it makes me wonder if we're potentially missing other kinds of flow, by not handling other kinds of definitions. Also, I feel like this should really be attached to an appropriate post-update node of the given argument. As it is written now, the flow will go from the argument _before_ the call, which obviously misses a step if the argument is modified by the call. In practice, I would expect this to be rather rare.
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