{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
            let entry = self.dwarf.unit.get_mut(entry_id);
            let return_dw_ty = self.debug_type(tcx, type_dbg, fn_abi.ret.layout.ty);
            entry.set(gimli::DW_AT_type, AttributeValue::UnitRef(return_dw_ty));