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In Return Stack Words in TurboForth Kernal
Moves the top cell from the data stack to the return stack.
Care should be taken to ensure the return stack is in the same state upon leaving a colon definition as it was when entering. DO/LOOP and FOR/NEXT use the return stack to hold loop parameters, therefore, if pushing data temporarily to the return stack during a loop, the return stack should be restore before a LOOP, +LOOP or NEXT is executed.