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-rw-r--r--lisp/progmodes/cc-styles.el2
1 files changed, 2 insertions, 0 deletions
diff --git a/lisp/progmodes/cc-styles.el b/lisp/progmodes/cc-styles.el
index 13ffd310fce..1a26e54bf06 100644
--- a/lisp/progmodes/cc-styles.el
+++ b/lisp/progmodes/cc-styles.el
@@ -355,6 +355,8 @@ when used elsewhere."
(completing-read prompt c-style-alist nil t
(cons c-indentation-style 0)
'c-set-style-history))))))
+ (or (stringp stylename)
+ (error "Argument to c-set-style was not a string"))
(c-initialize-builtin-style)
(let ((vars (c-get-style-variables stylename nil)))
(unless dont-override