range.c: check if range modifiable

* range.c (range_modify): frozen object cannot be modified.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56693 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_range.rb b/test/ruby/test_range.rb
index cfd8b502ed..a70361d6cb 100644
--- a/test/ruby/test_range.rb
+++ b/test/ruby/test_range.rb
@@ -11,6 +11,12 @@ class TestRange < Test::Unit::TestCase
     assert_equal((0...2), Range.new(0, 2, true))
   end
 
+  def test_frozen_initialize
+    r = Range.allocate
+    r.freeze
+    assert_raise(RuntimeError){r.__send__(:initialize, 1, 2)}
+  end
+
   def test_range_string
     # XXX: Is this really the test of Range?
     assert_equal([], ("a" ... "a").to_a)