+ SelfDescribing can parse up to single-quoted string def (problem is escaping)
* fixed single-quoted and double-quoted strings, added make-stmt and exit-stmt, added negative number literals, added token rx-angle-brkt (for rx-call, rx-cclass [negated or non-negated] and local rename [ eg <s=subrule> ])
* allow code blocks anywhere in regex
+ add special syms $/, $!, $_, $\d+ ; remove spurios space class-like, code-decl and prod-decl ; add token rx-braced
+ can haz stacked indirection