{"ast_node_type":"variable","tokens":[{"end":29,"kind":"keyword","start":0,"text":"let"}]}
        let span = self.span;
    pub fn as_note(&self, tcx: TyCtxt<'tcx>) -> errors::FrameNote {
        if tcx.def_key(self.instance.def_id()).disambiguated_data.data == DefPathData::Closure {