{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"let"}]}
        let closure_data = if mir_body.locals[mir_body.param_locals[0]].ty.as_reference().is_some()
            .map_err(|it| MirEvalError::MirLowerErrorForClosure(closure, it))?;
        {