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This works by adding data-flow edges to skip over array expressions when reading from arrays. On the post-update side, there was already code to skip over array expressions when storing to arrays. That happens in `valueToUpdate` in `AddressFlow.qll`, which needed just a small tweak to support assignments with non-field expressions at the top-level LHS, like `*a = ...` or `a[0] = ...`. The new code in `AddressFlow.qll` is copy-pasted from `EscapesTree.qll`, and there is already a note in these files saying that they share a lot of code and must be maintained in sync.