{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"SubregionOrigin::RelateParamBound(type_test_span,"}]}
                            SubregionOrigin::RelateParamBound(type_test_span, generic_ty, None);
                        let origin =
                        self.buffer_error(self.infcx.err_ctxt().construct_generic_bound_failure(