On Wed, Oct 25, 2017 at 06:25:37PM +0200, Tobias Geerinckx-Rice wrote:
> See 'Changes' in the source distribution for more information about the
> fixed security issues.
> 
> * gnu/packages/xml.scm (expat)[replacement]: Update to 2.2.4.
> (expat-2.2.2): Replace with ...
> (expat-2.2.4): ... new variable.

Okay, LGTM!