{"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
        let node = tcx.hir_node(fn_call_id);
        let fn_call_id = tcx.parent_hir_id(closure_id);
        let def_id = tcx.hir_enclosing_body_owner(fn_call_id);