Consider: what is a parser? Really, a parser is just a function that consumes less-structured input and produces more-structured output. By its very nature, a parser is a partial function—some values in the domain do not correspond to any value in the range—so all parsers must have some notion of failure.
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| Note on OODA Loop via wikipedia.org | Note on Parse, Don’t Validate via lexi-lambda.github.io |