Re: return first element in list with certain property

[Michael Heerdegen <michael_heerdegen@web.de>]

Emanuel Berg <moasen@zoho.com> writes:

> John Mastro wrote:
>
> > I do think it's perfectly reasonable to use seq.el and support only
> > Emacs versions >= 25.1.
>
> So if I do, I don't need to "package-require" it in the commented
> package header? It will be enough with just a `require'?

Yes.

> However since the "package-require" was supposed to be transparent,
> and not download anything unless needed, doesn't that amount to - if I
> put it there - it will be installed on < 25.1, but not installed on
> version where seq is part of vanilla Emacs?

Exactly.  Have a look at the "beacon" package for example.  It depends
on "seq" - see the header.  If you install it in Emacs 24, the "seq"
Elpa package will be installed along with it.  In Emacs 25, only the
"beacon" package itself is installed.  Try it!


Michael.