This isn't, of course, due to mergism - if the article had been merged, the redirect would've remained. But it illustrates the limitations of the search engine, and highlights the danger of trying to write large articles covering lots of stuff, rather than seperate, interlinked articles.
Dan
I've seen lots of people unfamiliar with Wikipedia complain because the search engine doesn't list any close matches and the go button confuses them too.
Regardless of whether mergism is good or not, I think the search engine could use some upgrading.
-Mgm