how to use old_pos ?

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i can see "old_pos" in MetaEditior prompt when i type old how to use old_pos? thanks
 

List of prompts in MetaEditor is generating periodically with some delay.

Most likely you had declared any variable, function, array or something like that with name "old_pos", but then that variable was deleted by you.

List of prompts is usually re-generating after compilation.

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