Created
April 26, 2016 06:41
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| let refine x : [`B | `C] option = | |
| match x with | |
| | `A -> None | |
| | (`B | `C) as x -> Some x | |
| let f (x : [`A | `B]) = | |
| match refine x with | |
| | None -> assert false | |
| | Some x -> x |
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