{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
            let root_vid = self.root_var(diverging_vid);
            let diverging_ty = Ty::new_var(self.tcx, diverging_vid);
            let can_reach_non_diverging = graph::depth_first_search(&coercion_graph, root_vid)