Add slide reviewing irrefutable patterns #2608
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fw-immunant
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djmitche
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We already talk about irrefutable patterns in day 1, but only briefly. I always review the concept at the beginning of the pattern matching section to refresh students' memories, so this is just formalizing that review into a slide at the beginning of the section. I also use this opportunity to introduce
_and.., which should help students understand that patterns can do more than just directly destructure values.