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 FRE(-2) Returns Fixed Lowest Value Even After Stack Shrinks, Example 1
 
 Example 1
 ---------
 
 The following code example demonstrates a case in which FRE(-2) goes
 down and stays down:
 
 ' To try this example in VBDOS.EXE:
 ' 1. From the File menu, choose New Project.
 ' 2. Copy the code example to the Code window.
 ' 3. Press F5 to run the program.
 
    DECLARE SUB test (num)
    CLS
    PRINT "Before any calls, FRE(-2):"; FRE(-2)
    CALL test(0)
    END
    SUB test (num)
      PRINT "Call number"; num; "on the way DOWN, FRE(-2):"; FRE(-2)
      IF num < 9 THEN
        CALL test(num + 1)
      ELSE
        PRINT "Bottom of recursion reached."
      END IF
      PRINT "Call number"; num; "on the way UP, FRE(-2):"; FRE(-2)
    END SUB