bug#18370: insert-file-contents: forbids also beg, end for non-regular (special) files

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Simple test case:
>
> (insert-file-contents "/dev/urandom" nil nil 10)
>
> This still fails in Emacs 29, and it would indeed be nice if it worked.
> I seem to remember this being discussed previously, and that...  er...
> no, I can't really recall anything more than that.
>
> Does anybody see any good reasons why we shouldn't allow this?  If not,
> I can take a stab at implementing it...

There were no objections, so I've now added this to Emacs 29.

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