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-rw-r--r--range.c1
-rw-r--r--test/ruby/test_range.rb6
2 files changed, 7 insertions, 0 deletions
diff --git a/range.c b/range.c
index 84a2dcc6790..68264992f37 100644
--- a/range.c
+++ b/range.c
@@ -80,6 +80,7 @@ rb_range_new(VALUE beg, VALUE end, int exclude_end)
static void
range_modify(VALUE range)
{
+ rb_check_frozen(range);
/* Ranges are immutable, so that they should be initialized only once. */
if (RANGE_EXCL(range) != Qnil) {
rb_name_err_raise("`initialize' called twice", range, ID2SYM(idInitialize));
diff --git a/test/ruby/test_range.rb b/test/ruby/test_range.rb
index cfd8b502ede..a70361d6cb2 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)