{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//"}]}
        // could take some type implementing `DynCompatibleTrait` but not `AutoTrait`,
        // for the `DynCompatibleTrait` shown above to be dyn-compatible because someone
        // unsize it to `dyn DynCompatibleTrait`, and call `.f()` which has no