git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1561 c06c8d41-db1a-0410-9941-cceddc491573
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return (object && (flags & (MAP_SEEN_FLAG | MAP_MAGIC_MAPPED_FLAG)));
return (object && (flags & MAP_GRID_KNOWN));