parse.y: escaped closing parenthsis

* parse.y (simple_re_meta): escaped closing parenthsis has different
  meaning.  [Bug #7610] [ruby-core:51088]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38663 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Dec 30 23:33:36 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (simple_re_meta): escaped closing parenthsis has different
+	  meaning.  [Bug #7610] [ruby-core:51088]
+
 Sun Dec 30 12:09:47 2012  Charlie Somerville  <charlie@charliesomerville.com>
 
 	* configure.in: use 4 argument form of AC_CHECK_HEADERS to force

parse.y

@@ -5971,6 +5971,7 @@ simple_re_meta(int c)
     switch (c) {
       case '$': case '*': case '+': case '.':
       case '?': case '^': case '|':
+      case ')':
 	return TRUE;
       default:
 	return FALSE;

test/ruby/test_regexp.rb

@@ -179,6 +179,12 @@ class TestRegexp < Test::Unit::TestCase
     assert_equal(expected, result)
   end
 
+  def test_source_escaped_paren
+    bug7610 = '[ruby-core:51088]'
+    s = '\(a\)'
+    assert_equal(/#{s}/, eval("%r(#{s})"), bug7610)
+  end
+
   def test_source_unescaped
     expected, result = "!\"#%&',-/:;=@_`~".each_char.map {|c|
       [