merge revision(s) 57374: [Backport #13135]

	string.c: rindex(//) should set $~.

	This seems a bug introduced by r520 (1.4.0).  [ruby-core:79110] [Bug #13135]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@58098 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 6 insertions, 5 deletions

diff --git a/string.c b/string.c
index 89723a08da..ade2be20b9 100644
--- a/string.c
+++ b/string.c
@@ -3083,10 +3083,8 @@ rb_str_rindex_m(int argc, VALUE *argv, VALUE str)
 	pos = str_offset(RSTRING_PTR(str), RSTRING_END(str), pos,
 			 enc, single_byte_optimizable(str));
 
-	if (!RREGEXP(sub)->ptr || RREGEXP_SRC_LEN(sub)) {
-	    pos = rb_reg_search(sub, str, pos, 1);
-	    pos = rb_str_sublen(str, pos);
-	}
+	pos = rb_reg_search(sub, str, pos, 1);
+	pos = rb_str_sublen(str, pos);
 	if (pos >= 0) return LONG2NUM(pos);
 	break;
 
diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 3375a8a3a3..69df6472d1 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -1126,6 +1126,9 @@ class TestString < Test::Unit::TestCase
 
     assert_nil("foo".rindex(//, -100))
     assert_nil($~)
+
+    assert_equal(3, "foo".rindex(//))
+    assert_equal([3, 3], $~.offset(0))
   end
 
   def test_rjust
diff --git a/version.h b/version.h
index 297184cedb..259c6ddd95 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.2.7"
 #define RUBY_RELEASE_DATE "2017-03-26"
-#define RUBY_PATCHLEVEL 430
+#define RUBY_PATCHLEVEL 431
 
 #define RUBY_RELEASE_YEAR 2017
 #define RUBY_RELEASE_MONTH 3