What about names?
What kind of names exist?
constant declarations function definitions applications
To manage these, we need to capture state.
We can do these via environments, which are functions from domain of names to domain of values.
Thus an environment e, in which x refers to the number 1, can be accessed by applying e to x, e(x) = 1.
Names in SourceD are then translated to instructions LDS x (LoaD Symbolic).
x -> LDS x
Whenever we encounter a name, we then push it onto the stack.