A way to show which local variables are used

Sometimes, during the creation of macros, we create some variables and other few may become unused.
If the macro is big enough, it's kinda hard to find the idle vars.

My suggestion is to implement a way to "delete all idle local vars"
Or maybe, show a little number somewhere beside a local var telling how many lines of action are using that var. (And maybe which lines?)
Or, at least, a symbol somewhere, just to mark an idle var.

I think any of these ideas may help. :D
 
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