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<https://twitter.com/manishearth/status/1202074478668206080?s=21>

I'm not sure what it means to exhaustively pattern match in in a CLI

a user can theoretically type in an arbitrary-length string

certainly strings that would be intractable to match on in code

you have to have some kind of parsing function `String -&gt; ParsedDataStructure` before you have something you can tractably exhaustively match on

oh yes i believe this was referring to things like parsing input hygienically as you describe