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2.5.3.1.10 PopStack

A support function, PopStack, pops the topmost operand from the stack.

STACKELEMENT
PopStack (
      STACK ResultStack,
      INT32 StackPos
   )
    --
    -- On entry
    --    ResultStack is the stack.
    --    StackPos is the stack position

    IF StackPos equals 0 THEN
       Return NULL
    END IF

    Decrement StackPos by 1
    Return ResultStack[StackPos]
END-SUBROUTINE
 
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