if the following are true:

• expression state at time 5 = "iterate_args"
• arguments stack at time 5 = [ [ 3, [ ] ], [ ] ]
• parent stack at time 5 = [ __eq__(1, 3), [ ] ]

then parent stack at time 6 = [ __eq__(1, 3), [ ] ]

Start from the conclusion and work back up the proof. Click the arrow to show the parents.