Today I try to write a function that call comment-dwim, it works
when I 'M-x comment-dwim', but when I call it as (comment-dwim), it
says wrong argument number, but after checking the doc and read the
source, I still can't figure out how to give args, which what I want
is the current line where my cursor is.
I add 'nil' to 'comment-dwim' and fixed, but it will be better to
add something about what args should a caller give, and that will
not confused to at least elisp newbie, and it is better.
Thanks.