make Grin -> C conversion a bit smarter about assigning tuples to variables
make Grin -> C conversion a bit smarter about assigning tuples to variables

darcs-hash:20070522041737-1a7c6-ae162f96b9d7969b311f5ef1e94808eddf5881c1

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