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diff --git a/lib/regcomp.c b/lib/regcomp.c
index 6472ff6..fadf36d 100644
--- a/lib/regcomp.c
+++ b/lib/regcomp.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 "intprops.h"
+#include "verify.h"
static reg_errcode_t re_compile_internal (regex_t *preg, const char * pattern,
size_t length, reg_syntax_t syntax);
static void re_compile_fastmap_iter (regex_t *bufp,
@@ -2571,7 +2573,8 @@ parse_dup_op (bin_tree_t *elem, re_string_t *regexp, re_dfa_t *dfa,
/* This loop is actually executed only when end != REG_MISSING,
to rewrite <re>{0,n} as (<re>(<re>...<re>?)?)?... We have
already created the start+1-th copy. */
- if ((Idx) -1 < 0 || end != REG_MISSING)
+ verify (! TYPE_SIGNED (Idx));
+ if (end != REG_MISSING)
for (i = start + 2; i <= end; ++i)
{
elem = duplicate_tree (elem, dfa);
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