+ - do Forest/Tree still need a Region?
+ - reconsider the degree of genericization
+ - GraphViz stuff pollutes the API...
+ - Forest needs a "manual access" API
+ - the unwrap bit in Forest makes it really hard to expose an API for forests
+
+ - evil problems with (x y? z /ws)
+ - ParseFailed, GSS, Walk, Parser, Sequence, Forest
+ - copyright notices
+ - documentation
+
+ - grammar highlighting?
+ - comment indentation vs block indentation?
+ - { and } in <pre>
+ - recursive { { foo } }