git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9147 c06c8d41-db1a-0410-9941-cceddc491573
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#endif
// Trapdoor spiders hide if they can't see their target.
bool can_see;
// Trapdoor spiders hide if they can't see their foe.
// (Note that friendly trapdoor spiders will thus hide even
// if they can see you.)
const actor *foe = monster->get_foe();
const bool can_see = foe && monster->can_see(foe);