Re: Updating defcustom variables in elisp code

[Jean Louis <bugs@gnu.support>]

Do this:

{M-x customize-group RET savehist RET}

Find:

Hide Savehist Additional Variables:
Repeat:
[INS] [DEL] Variable: rcd-sample
[INS]
   [ State ]: SET for current session only.
   List of additional variables to save. Hide
   Each element is a variable that will be persisted across Emacs
   sessions that use Savehist.
   
   An element may be variable name (a symbol) or a cons cell of the form
   (VAR . MAX-SIZE), which means to truncate VAR’s value to at most
   MAX-SIZE elements (if the value is a list) before saving the value.

As that can save variables.

-- 
Jean

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