{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"hir::ClosureKind::Closure"}]}
            hir::ClosureKind::Closure if self.tcx.is_lang_item(def_id, LangItem::FnOnceOutput) => {
        match closure_kind {
                self.extract_sig_from_projection(cause_span, projection)