Unfortunately, travis CI has old oniguruma library

So we can't test it there.

Author: smalyshev

ext/mbstring/tests/mbregex_stack_limit.phpt

@@ -2,6 +2,8 @@
 Test oniguruma stack limit
 --SKIPIF--
 <?php extension_loaded('mbstring') or die('skip mbstring not available'); ?>
+--XFAIL--
+Travis CI has old oniguruma library
 --FILE--
 <?php
 $s = str_repeat(' ', 30000);

ext/mbstring/tests/mbregex_stack_limit2.phpt

@@ -2,6 +2,8 @@
 Test oniguruma stack limit
 --SKIPIF--
 <?php extension_loaded('mbstring') or die('skip mbstring not available'); ?>
+--XFAIL--
+Travis CI has old oniguruma library
 --FILE--
 <?php
 function mb_trim( $string, $chars = "", $chars_array = array() )