{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"///"}]}
    /// If we have an input `Foo<?A, ?B>`, then after generalization we will wind
    /// However, whatever it is, for `Foo` to be WF, it must be equal to `A::Item`.
    /// up with a type like `Foo<?C, ?D>`. When we enforce `Foo<?A, ?B> <: Foo<?C, ?D>`,