{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":".map_err(|it|"}]}
            .map_err(|it| MirEvalError::MirLowerErrorForClosure(closure, it))?;
            )
        let closure_data = if mir_body.locals[mir_body.param_locals[0]].ty.as_reference().is_some()