range.c: check if exclude_end? is defined

* range.c (rb_range_values): should raise TypeError if necessary
  method is not defined, not NoMethodError, when trying to tell if
  the object is a Range and extract info.
  [ruby-core:83541] [Bug #14048]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60411 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/test/ruby/test_enum.rb b/test/ruby/test_enum.rb
index fcf601c183..ae119c73bf 100644
--- a/test/ruby/test_enum.rb
+++ b/test/ruby/test_enum.rb
@@ -966,6 +966,19 @@ class TestEnumerable < Test::Unit::TestCase
     assert_int_equal(5, (2..0).sum(5))
     assert_int_equal(2, (2..2).sum)
     assert_int_equal(42, (2...2).sum(42))
+
+    not_a_range = Class.new do
+      include Enumerable # Defines the `#sum` method
+      def each
+        yield 2
+        yield 4
+        yield 6
+      end
+
+      def begin; end
+      def end; end
+    end
+    assert_equal(12, not_a_range.new.sum)
   end
 
   def test_uniq