MonadTrans instance, and foldTree'
MonadTrans instance, and foldTree'

Ignore-this: 38ec053b456f1b5b9aa9cde25141d957

darcs-hash:20081201190303-b62a5-d3474115011f4f2b1e0e06ff4bce9d75145f6299.gz

pepeiborra/narradar,pepeiborra/narradar,pepeiborra/narradar