{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"///"}]}
    /// would be `Trait<Assoc = A> + Send`. If this list doesn't have a principal trait ref,
    /// `Foo<dyn Trait<Assoc = A> + Send>` from a value of type `Foo<T>`, then `dyn_ty`
    /// we only need the basic vtable prefix (drop, size, align).