Attempting to highlight syntax for the R programming language in wikipedia using Extension:SyntaxHighlight GeSHi results in the following error:
GeSHi Error: GeSHi could not find the language rsplus (using path /usr/local/apache/common-local/wmf-deployment/lib/GeSHi-18.104.22.168/geshi/) (code 2)
The error also lists a number of supported languages (rsplus not among them). The error can be recreated by going to the following file page on wikipedia (http://en.wikipedia.org/wiki/File:First_order_hsked.png) and removing the comments.
I don't know if this is an error in the mediawiki site (as in, R/S+ is not a supported language), or we have the wrong revision installed (but I think the listed langauges on the mediawiki page are for 1.0.8), or because of another local problem.
On a political note, R is Free software, so for our stats and econ articles if we include code it would be better for FOSS to use R as opposed to SAS. That's a minor point though.