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Skyward Wildfire says it can prevent lightning using military tech, but the research is dubious.
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It's also possible to have laxer validation by inverting the constraints (though not in combination with the semantic input type) but that's less interesting so I am leaving that experiment out in the interest of not needlessly burning compute resources.
| LetRec of name * expr * expr (* let rec f = e1 in e2 *)