Fix parsing of @ patterns so that Data.HashTable parses
Fix parsing of @ patterns so that Data.HashTable parses

darcs-hash:20080316232916-90c7a-9ff4388c15cbdcbc4106f0a18be1c441967161bb

jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc