Trying to move [[testwiki:User:MER-C]] with subpages and talk pages generates the following database error:
A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was:
(SQL query hidden)
from within function "Article::insertOn". MySQL returned error "1062: Duplicate entry '2-MER-C' for key 2 (10.0.0.101)".
Only one page is moved. Logs of attempts are at http://test.wikipedia.org/w/index.php?title=Special%3ALog&type=move&user=MER-C&limit=6 .