{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"assert_matches!(fallback.def,"}]}
                    assert_matches!(fallback.def, ty::InstanceKind::Item(_));
                    assert!(!self.tcx.intrinsic(fallback.def_id()).unwrap().must_be_overridden);
                    return self.init_fn_call(