Add &optional for lambda function.
@lisp
@group
-(setq wl-highlight-x-face-func 'x-face-mule:x-face-decode-message-header)
+(setq wl-highlight-x-face-func
+ (function
+ (lambda (&optional beg end)
+ (x-face-mule:x-face-decode-message-header))))
(require 'x-face-mule)
@end group
@end lisp
@lisp
@group
-(setq wl-highlight-x-face-func 'x-face-mule-x-face-decode-message-header)
+(setq wl-highlight-x-face-func
+ (function
+ (lambda (&optional beg end)
+ (x-face-mule-x-face-decode-message-header))))
(require 'x-face-mule)
@end group
@end lisp
@lisp
@group
-(setq wl-highlight-x-face-func 'x-face-mule:x-face-decode-message-header)
+(setq wl-highlight-x-face-func
+ (function
+ (lambda (&optional beg end)
+ (x-face-mule:x-face-decode-message-header))))
(require 'x-face-mule)
@end group
@end lisp
@lisp
@group
-(setq wl-highlight-x-face-func 'x-face-mule-x-face-decode-message-header)
+(setq wl-highlight-x-face-func
+ (function
+ (lambda (&optional beg end)
+ (x-face-mule-x-face-decode-message-header))))
(require 'x-face-mule)
@end group
@end lisp