{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":".map_err(|e|"}]}
            .map_err(|e| (e, true)),
            .and_then(|it| ProcMacroClient::spawn(&it, extra_env).map_err(Into::into))
        ProcMacroServerChoice::Explicit(path) => {