Pattern-matching needs implementation

```
Matching on cases, performing pattern bindings, and matching whole trees of 
patterns needs to be implemented.  Some syntax is needed for matching on cases 
while binding the whole variant object to a name rather than binding each 
element of the contents to separate names.
```

Original issue reported on code.google.com by `eligottlieb@gmail.com` on 27 Apr 2011 at 6:31
