 * [Upstream Documentation](wiki?name=Upstream+Documentation)
 * [:default](wiki?name=:default)
 * [:discard](wiki?name=:discard)
 * [discard default](wiki?name=discard+default)
 * :lexeme - __TODO__
 * [lexeme default](wiki?name=lexeme+default)
 * [Rewriting precedenced rules](wiki?name=rewriting+precedenced+rules)
 * [Adverbs and their users](wiki?name=adverbs+vs+users)
 * [Semantic values](wiki?name=Semantic+values)

Unsorted thoughts

 * [Fast Sparse Integer Sets in C](wiki?name=fast+sparse+integer+sets+in+C)
   (Sets to hold acceptable symbol (ids))
 * [Unicode handling](wiki?name=handling+unicode)