{"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
            let closure_head_span = self.tcx.def_span(closure_def_id);
            let closure_hir_id = self.tcx.local_def_id_to_hir_id(closure_def_id);
            self.tcx.node_span_lint(