re.c: options for sub-regexp

* re.c (rb_reg_to_s): needs embedded options to check syntax of
  sub-regexp.  [ruby-core:82328] [Bug #13798]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

re.c

@@ -606,7 +606,7 @@ rb_reg_to_s(VALUE re)
 
 	    ++ptr;
 	    len -= 2;
-            err = onig_new(&rp, ptr, ptr + len, ONIG_OPTION_DEFAULT,
+            err = onig_new(&rp, ptr, ptr + len, options,
 			   enc, OnigDefaultSyntax, NULL);
 	    onig_free(rp);
 	    ruby_verbose = verbose;

test/ruby/test_regexp.rb

@@ -74,6 +74,12 @@ class TestRegexp < Test::Unit::TestCase
     end
   end
 
+  def test_to_s_extended_subexp
+    re = /#\g#{"\n"}/x
+    re = /#{re}/
+    assert_warn('', '[ruby-core:82328] [Bug #13798]') {re.to_s}
+  end
+
   def test_union
     assert_equal :ok, begin
       Regexp.union(