Additional observational targets: the 1969 Apollo 12 and 1971 Apollo 14 landing zones, plus peripheral areas of the southern polar region designated for future missions. More distant visible objects will include Mercury, Venus, Mars and Saturn - alongside Earth itself.
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Third, it introduces negative reasoning into the type system. The correctness of the match expression relies on the assumption that certain types aren’t compatible or aren’t inhabitable. Negative reasoning like this is not inherently unsound (after all, OCaml does it!) but it is very risky. The problem is that suddenly the soundness of your type system depends on global assumptions about the absence of other behavior. It’s very easy to accidentally add a type system feature or even just a library which violates this assumption.