{"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
        let fn_decl = self.infcx.tcx.hir_fn_decl_by_hir_id(fn_hir_id)?;
        let fn_hir_id = self.infcx.tcx.local_def_id_to_hir_id(did);