slightly better error messages
slightly better error messages

Ignore-this: 3f84db1930247040095d1aba6715fe3b

darcs-hash:20090928090016-115f9-f16170f2165b30f45b405a30fd9d6db78fb9d4bb.gz

mwu-tow/cuda,phaazon/cuda,phaazon/cuda,phaazon/cuda