封闭房间，迷宫，和其他障碍，也可从墙上构造部分。
Enclosed rooms, mazes, and other barriers can also be constructed from wall sections.
泛型类型定义不可以从封闭构造的类型赋值。
A generic type definition is not assignable from a closed constructed type.
即使封闭泛型类型为封闭构造类型，也是如此。
This is true even if the enclosing generic type is a closed constructed type.
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