shaft trap.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9850 c06c8d41-db1a-0410-9941-cceddc491573
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const bool is_shaft = (get_trap_type(mon->pos()) == TRAP_SHAFT);
// All types of stairs.
else if (is_shaft && mons_flies(mon)) simple_monster_message(mon, " goes down the shaft.");
else if (is_shaft && mons_flies(mon))
simple_monster_message(mon, " goes down the shaft.");