Re: incompatible change of toogle-truncate-lines

[Stefan Monnier <monnier@iro.umontreal.ca>]

> Unfortunately the defun in Emacs 21 [1] accepts no argument and the
> version in Emacs 22 [2] must be called with one argument.

> Is there any problem with making ARG optional in Emacs 22?  May I
> install this patch?

Sounds like the right thing to do, indeed.

> If not: Is there a simple way to check if `toogle-truncate-lines'
> expects zero or one arguments?  (Well, I could check
> `emacs-major-version', but that's ugly.)

Although your fix is much better, a generic answer to this question could
look like:

  (condition-case nil
      (toggle-truncate-lines t)
    (wrong-number-of-arguments (toggle-truncate-lines)))


-- Stefan