{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"(xform_self_ty,"}]}
                    (xform_self_ty, xform_ret_ty) =
                    let trait_ref = ocx.normalize(cause, self.param_env, trait_ref);
                        self.xform_self_ty(probe.item, trait_ref.self_ty(), trait_ref.args);