git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8012 c06c8d41-db1a-0410-9941-cceddc491573
DIJOFXQUR42HCNAOUDU662PEDPVWEE26F47T5TFB4ZHSY745AT7AC
IB4IOXRL7AMMYTUE7GKYDYI6FE5ZFDIUG7DXAZIRMNEPA7KVSSWQC
SIDH2P7NBIG5KEOE27XHD3ZT2NQ2OJZFN6VZXWNWYFFY5YVXSSVQC
K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
ASSERT(mgrd(c) == NON_MONSTER || c == pos());