{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"for"}]}
        for (idx, bound_var) in bound_inputs_and_output.bound_vars().iter().enumerate() {
        let bound_inputs_and_output = self.compute_inputs_and_output(&indices, defining_ty);
            if let ty::BoundVariableKind::Region(kind) = bound_var {