Once I finally realized that fully structural polymorphic types were impossible, I was forced to switch to the next best thing, spine constructors. Effectively, this means that the non-polymorphic parts of polymorphic types are still subject to subtyping, but the polymorphic parts of the type have to match exactly.
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五角大楼震惊于美军导弹消耗速率，夺取哈尔克岛计划是否形同自毁？