change Occurance to a UseInfo structure to record various bits of information about how variables are used
change Occurance to a UseInfo structure to record various bits of information about how variables are used

darcs-hash:20060814070017-1a7c6-49ee1fafe1f1dce58e957ae0dc0a8870d60c1c0b

kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc