When this program is compiled, the compiler knows exactly where the instruction pointer needs to jump to get to first_function and some_function, since it knows exactly where in the executable it put them. Chances are that if you looked at the assembly they would each just be a single instruction to jump a nice fixed offset.
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If we would think of the invisible walls in Bobs world as actual walls, say by a street lamp, we would get the following picture:
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