Iterate Arguments Finished State Rule

When the state is "iterate_args" and the "Arguments" stack is empty, then the "Expression State" is updated to "call_function_begin."

Argument iteration is finished, and entering the "call_function_begin" state signals that LW Python should evaluate the parent expression.

For example,

if the following are true:

• expression state at time 9 = "iterate_args"
• arguments stack at time 9 = [ [ ], [ ] ]
• parent stack at time 9 = [ add_three(a), [ ] ]

then expression state at time (9 + 1) = "call_function_begin"

Try stepping through the simulator to see the "Expression State" change to "call_function_begin."

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