{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
            let return_dw_ty = self.debug_type(tcx, type_dbg, fn_abi.ret.layout.ty);
        if !fn_abi.ret.is_ignore() {
            let entry = self.dwarf.unit.get_mut(entry_id);