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Using a `defconst' or `defvar' While the Variable Has a Local Binding Sets the Global Binding?

The GNU Emacs Lisp Reference Manual, 12.5 Defining Global Variables: If you use a defconst or defvar special form while the variable has a local binding (made with let, or a function argument), it ...
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Updating old customization code using deprecated lexical-let

Old code (lexical-let ((beg -1) (end -1) (prev-mid -1)) (defun forward-binary () (interactive) (if (/= prev-mid (point)) (setq beg -1 end -1) (setq beg prev-mid)) (if ...
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