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diff --git a/lib/regex_internal.c b/lib/regex_internal.c
index 904b88e..61c8d9d 100644
--- a/lib/regex_internal.c
+++ b/lib/regex_internal.c
@@ -18,6 +18,8 @@
with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+#include "verify.h"
+#include "intprops.h"
static void re_string_construct_common (const char *str, Idx len,
re_string_t *pstr,
RE_TRANSLATE_TYPE trans, bool icase,
@@ -1390,7 +1392,10 @@ static void
internal_function
re_node_set_remove_at (re_node_set *set, Idx idx)
{
- if (idx < 0 || idx >= set->nelem)
+ verify (! TYPE_SIGNED (Idx));
+ /* if (idx < 0)
+ return; */
+ if (idx >= set->nelem)
return;
--set->nelem;
for (; idx < set->nelem; idx++)
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