somewhat better error messages for internal codegen failure
somewhat better error messages for internal codegen failure

Ignore-this: fe41fc85ff82ccb3f5ebff2df5e91719

darcs-hash:20100723070854-dcabc-f2d955a90ba3955eb085beaa650bad2d5f689eb0.gz

robeverest/accelerate,rrnewton/accelerate,wilbowma/accelerate,robeverest/accelerate,wilbowma/accelerate,sjfloat/accelerate