My understanding of TODO tests is they're all expected to fail, and what's unexpected (and reported on) is for them to pass.

As for the "how correct" problem, my approach to that situation would be:

• make a function that evaluates (say on a scale from 0-1) how correct a given expression is, against given criteria
• make an "ok_ish" function that takes the output of the above, together with a minimum value, and fails if that value drops below a threshold

That second one would allow spotting regressions in how correct one's parsing was.

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