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diff --git a/src/grep/gnulib-tests/test-setlocale_null.c b/src/grep/gnulib-tests/test-setlocale_null.c
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+/* Test of setlocale_null_r function.
+ Copyright (C) 2019-2021 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2019. */
+
+#include <config.h>
+
+/* Specification. */
+#include <locale.h>
+
+/* Check that SETLOCALE_NULL_ALL_MAX is a constant expression. */
+static char buf[SETLOCALE_NULL_ALL_MAX];
+
+int
+main ()
+{
+ /* Check that setlocale_null_r() can be used with $(LIB_SETLOCALE_NULL). */
+ return setlocale_null_r (LC_ALL, buf, sizeof (buf)) != 0;
+}