git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8225 c06c8d41-db1a-0410-9941-cceddc491573
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wall_flv = env.tile_flv[gx][gy].wall;
floor_flv = env.tile_flv[gx][gy].floor;
special_flv = env.tile_flv[gx][gy].special;
wall_flv = env.tile_flv[gc.x][gc.y].wall;
floor_flv = env.tile_flv[gc.x][gc.y].floor;
special_flv = env.tile_flv[gc.x][gc.y].special;