looking-at function behaviour

[Andrea Crotti <andrea.crotti.0@gmail.com>]

I don't understand how I should use the looking-at function, from what I
see in the doc is not what I see happening.

--8<---------------cut here---------------start------------->8---
 (when (not (looking-at closing-char))
   (insert closing-char))
 (newline-force))))
--8<---------------cut here---------------end--------------->8---

With this code I would like to
- see if a char is before the end of line
- insert it if not

Is quite simple but it doesn't work.
And even trying now on the fly

(looking-at "a") ;; "a"

Is anyway always nil, how then am I supposed to do it given that this is
the function which reading at the info page should be used?