merges r30467 from trunk into ruby_1_9_2.

--
* ext/stringio/stringio.c (get_strio, strio_set_string)
  (strio_reopen): check if frozen.  [ruby-core:33648]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30565 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index b7327adced..78718a2d86 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -471,4 +471,13 @@ class TestStringIO < Test::Unit::TestCase
       expected_pos += 1
     end
   end
+
+  def test_frozen
+    s = StringIO.new
+    s.freeze
+    bug = '[ruby-core:33648]'
+    assert_raise(RuntimeError, bug) {s.puts("foo")}
+    assert_raise(RuntimeError, bug) {s.string = "foo"}
+    assert_raise(RuntimeError, bug) {s.reopen("")}
+  end
 end