Lexical classes now essentially work and are tested. We'll no doubt f…

…ind bugs, but I the bulk of the work is done, so move them to completed section of the ROADMAP.

docs/ROADMAP

@@ -27,7 +27,6 @@ Really important items
 1 ***   REPL remembers the variable from the last line (D, jnthn)
 1 *     lexical variables in regexes (B, bkeeler, masak, jnthn)
 1 **    operator overloading -- infix:, prefix:, postfix: (almost there, problems with pre-comp)
-1 **    lexical classes and roles (jnthn)
 1 **    import module symbols into current lexical scope (D, jnthn)
 1 **    improved error messages and failure modes (B, all)
 1 *     attention-grabbing examples (all)
@@ -114,3 +113,4 @@ Completed ROADMAP items:
   - basic s/// (done)
   - protoregexes in grammars (done)
   - item assignment (done)
+  - lexical classes and roles (done)