This raises a general point: should we have a playpen sub-forum where would-be posters can check and edit their proposed postings before subsequently copying the final product to its intended place? This facility is quite common on sites which encourage user-generated content.
Such a place would carry a guarantee that nothing placed there would be permanent (admins or a script could periodically flush everything over a certain age, for instance). It would allow people to learn and it would confine (most) uncovered bugs to a harmless place of quarantine.