- use syntax classes for tc-literal
- remove one-armed if
- fix comments
- use syntax classes for find-annotation
- unit contracts for inference unit and typechecker unit
- macro to enable/disable unit contracts
- correct fold/free-var calculation for latent effects
- documentation improvements
- add bindings for additional special type forms
- U and Un are the same binding, same with Tuple and List
- fix types for integer?, exact-integer?
- write not-yet-enabled syntax-class based type parser
svn: r13440