Make macro-system type and constructor names more uniform; more comments.

src/libsyntax/parse/common.rs

@@ -86,7 +86,7 @@ impl parser_common of parser_common for parser {
     fn parse_ident() -> ast::ident {
         alt copy self.token {
           token::IDENT(i, _) { self.bump(); ret self.get_str(i); }
-          token::ACTUALLY(token::w_ident(*)) { self.bug(
+          token::INTERPOLATED(token::nt_ident(*)) { self.bug(
               ~"ident interpolation not converted to real token"); }
           _ { self.fatal(~"expected ident, found `"
                          + token_to_str(self.reader, self.token)