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 CLEAR [,,stacksize&]
 
 Usage Notes
   ■ If your program has deeply nested subroutines or procedures, or if you
     use recursive procedures, you may want to use a CLEAR statement to
     increase the stack size. You may also want to increase the stack size
     if your procedures have a large number of arguments.
 
   ■ Clearing the stack destroys the return addresses placed on the stack
     during a GOSUB operation. This makes it impossible to execute a RETURN
     statement correctly, and Visual Basic generates a "RETURN without GOSUB"
     run-time error message. If you use a CLEAR statement in a SUB or
     FUNCTION statement, Visual Basic generates the run-time error message,
     "Illegal function call."