that exit isn't its target.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9681 c06c8d41-db1a-0410-9941-cceddc491573
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const dungeon_feature_type gridc = grd(*ri);
// All types of stairs.
if (is_stair(gridc))
e.push_back(level_exit(*ri, false));