Фигуристка Аделия Петросян лишилась аксессуаров Dior из-за гражданства РФ14:44
As mentioned previously, in addition to type witnesses and existential types, GADTs in OCaml also change the way that match exhaustiveness checking works. This means that in some cases when using GADTs, you are allowed (and in fact required) to omit some of the variants when pattern matching. In other cases, you have to include the variant in the match, but you can just put . on the right hand side instead of supplying a body for the match arm.
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