`C-h f' doesn't show file where function comes from

[Katsumi Yamaoka]

Hi,

When I start Emacs with

  emacs -Q -l wid-edit

and type

  C-h f widget-button-press RET

Emacs 22.2.92 shows:
--8<---------------cut here---------------start------------->8---
widget-button-press is an interactive compiled Lisp function in 
`/local/share/emacs/22.2.92/lisp/wid-edit.elc'.
(widget-button-press pos &optional event)

Invoke button at pos.
--8<---------------cut here---------------end--------------->8---

However, Emacs 23.0.60 shows:
--8<---------------cut here---------------start------------->8---
widget-button-press is an interactive compiled Lisp function.


(widget-button-press pos &optional event)

Invoke button at pos.
--8<---------------cut here---------------end--------------->8---

Why do those results differ?  The way of Emacs 23.0.60 is
inconvenient to me.  I need to evaluate (symbol-file 'FN) when I
want to know where the file providing the function definition is.

Regards,