(cols (nth 1 wsb)))
(cond
((not (memq side '(left right)))
- (error "`left' or `right' expected instead of %S" side))
+ (error "‘left’ or ‘right’ expected instead of %S" side))
((and (eq vtype side) cols))
((eq (frame-parameter nil 'vertical-scroll-bars) side)
;; nil means it's a non-toolkit scroll bar, and its width in