{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//"}]}
        // If either `source` or `target` is a type variable, then any applicable impl
        // We can take advantage of this fact to avoid performing unnecessary work.
        // would need to be generic over the self-type (`impl<T> CoerceUnsized<SomeType> for T`)