Use rustdoc to test examples on the wiki

[brson]

We can use our evolving documentation-testing scripts to test examples on the wiki as well.

Depends on #3546

[pnkfelix]

probably a subbug of #5413.

I vaguely recall some discussion of this idea or something like it (at least in terms of whether it would be a rathole). Is the main point that rustdoc would automatically mark the wiki examples as being compilable and/or runnable with a particular rust version?

I guess as long as it does not burden the common case users of the tool; e.g. a random developer who does not ask rustdoc to specifically do the wiki traversal should not be inundated with warnings/errors about examples on the wiki.

[emberian]

This doesn't make sense for rustdoc to do at all. Closing. (@brson reopen if you feel otherwise)