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-rw-r--r--lisp/custom.el1
1 files changed, 1 insertions, 0 deletions
diff --git a/lisp/custom.el b/lisp/custom.el
index df6db181615..083349e3591 100644
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -667,6 +667,7 @@ If NOSET is non-nil, don't bother autoloading LOAD when setting the variable."
A customizable variable is either (i) a variable whose property
list contains a non-nil `standard-value' or `custom-autoload'
property, or (ii) an alias for another customizable variable."
+ (declare (side-effect-free t))
(when (symbolp variable)
(setq variable (indirect-variable variable))
(or (get variable 'standard-value)