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diff --git a/lib/unicase/u16-is-casefolded.c b/lib/unicase/u16-is-casefolded.c
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+/* Test whether an UTF-16 string is already case-folded.
+ Copyright (C) 2009 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+ This program is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include "unicase.h"
+
+#include "unicase/invariant.h"
+
+int
+u16_is_casefolded (const uint16_t *s, size_t n, const char *iso639_language,
+ bool *resultp)
+{
+ return u16_is_invariant (s, n, u16_casefold, iso639_language, resultp);
+}