I favor using a map as the state because I think the information in
your example is an integral part of most parsing goals, not meta-data
retained to serve an auxiliary purpose. An example of what I would
consider meta-data for a parser would be the number of calls to
consumption functions the par
I'm trying to make a decision in a parser library between using
regular maps as states (containing a sequence of remaining tokens, as
well as other info) vs. using metadata maps attached to the sequence
of remaining tokens. In other words:
{:remainder [\r \e \m], :index 3, :line 5, :column 2}
