(In reply to comment #0)

If that can be had without restructuring or rewriting the parser,
I might give it a try myself.

Did you give it a try? Also, don't fear the parser! ;)

I did not have the time to look into it yet, but maybe it is an option to do so during the upcoming Hackaton :-) where all the experts are about.

We should be able to get the value of "{{Factorial|2}}" by using a template such as the following [[Template:Factorial]]:

{{#ifexpr: {{{1|0}}} < 2

{{#expr: {{{1}}}
 *{{Factorial|
   {{#expr: {{{1}}} - 1 }}
  }}
}}

}}

}}

Currently, all we get is "Template loop detected" =(

Maybe the new parser could handle this? (adding "newparser" keyword)

Unsure if this request (adding a $wgTemplateLoopLimit setting) still makes sense now that we have Lua/Scribunto which makes template execution way faster, hence proposing WONTFIX here.

http://en.wikipedia.org/wiki/Wikipedia:Template_limits#How_can_you_find_out.3F explains how to find out if limitations are set (and I assume this applies to any wiki, not just Wikimedia ones).

If you have questions about Lua, please post on http://en.wikipedia.org/wiki/Wikipedia_talk:Lua , and see http://www.mediawiki.org/wiki/Lua_scripting and http://blog.wikimedia.org/tag/lua/ for more information.

(In reply to comment #5)

Unsure if this request (adding a $wgTemplateLoopLimit setting) still makes
sense now that we have Lua/Scribunto which makes template execution way
faster, hence proposing WONTFIX here.

Scribunto is not only faster, it also has looping constructs, and much cleaner syntax for this sort of thing. WONTFIX sounds good to me.