Add characterization coverage for the relationship between Choice, Attempt, and Label, to demonstrate the incremental effect of repeatedly applying Attempt in reaction to parse failures, and to demonstrate the impact that backtracking has on error messages in extreme cases.
Add characterization coverage for the relationship between Choice, Attempt, and Label, to demonstrate the incremental effect of repeatedly applying Attempt in reaction to parse failures, and to demonstrate the impact that backtracking has on error messages in extreme cases.

plioi/parsley