{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"for"}]}
        for (arg, activity) in sig.decl.inputs.iter().zip(x.input_activity.iter()) {
            .any(|&act| matches!(act, DiffActivity::DuplicatedOnly | DiffActivity::DualOnly));
            d_inputs.push(arg.clone());