{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
                let va_list = PlaceRef::alloca(bx, bx.layout_of(arg_ty));
            if fx.fn_abi.c_variadic && arg_index == fx.fn_abi.args.len() {
                bx.va_start(va_list.val.llval);