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5c3109a324
This turned out to be a fairly simple but easy to make bug. When we want to figure out the value pointed-to in a multi-assignment, we look at the left hand side to see what value from the right hand side we should assign. Unfortunately, we accidentally attempted to look up this information in the _left hand side_ of the assignment, resulting in no points-to information at all. The only thing needed to fix this was to properly link up the left and right hand sides: using the left hand side to figure out what index to look at, and then looking up the points-to information for the corresponding place in the right hand side.