add a test case

diff --git a/test/test_utf8.c b/test/test_utf8.c
index 21acff8fdf4af20a209efc4a00026a0dcf81306f..9682a1a0256f71a37de746268c2e40c09b3fd578 100644 (file)
--- a/test/test_utf8.c
+++ b/test/test_utf8.c
@@ -1208,6 +1208,7 @@ extern int main(int argc, char* argv[])
   x2("((?(a)\\g<1>|b))", "aab", 0, 3);
   x2("((?(a)\\g<1>))", "aab", 0, 2);
   x2("(b(?(a)|\\g<1>))", "bba", 0, 3);
+  e("(()(?(2)\\g<1>))", "", ONIGERR_NEVER_ENDING_RECURSION);
 
   n("   \xfd", ""); /* https://bugs.php.net/bug.php?id=77370 */
   /* can't use \xfc00.. because compiler error: hex escape sequence out of range */