{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"//"}]}
                    // This behavior is only there for the old solver, the new solver
                super_combine_tys(&infcx.infcx, self, a, b).map(|_| ()).or_else(|err| {
                    // shouldn't ever fail. Instead, it unconditionally emits an