fix bug in post-lambdalifting optimization where bound names might be reused by accident
fix bug in post-lambdalifting optimization where bound names might be reused by accident

darcs-hash:20070302091631-1a7c6-44d2de671978fafd2ed552357ac688a5d6580a66

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