* vm_method.c (rb_alias): should raise TypeError if klass is nil.

  1.instance_eval { alias to_string to_s } causes SEGV before this
  fix.
* test/ruby/test_alias.rb (test_special_const_alias): ditto.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@25826 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/ruby/test_alias.rb b/test/ruby/test_alias.rb
index 7f8a32c52..babd76357 100644
--- a/test/ruby/test_alias.rb
+++ b/test/ruby/test_alias.rb
@@ -77,4 +77,12 @@ class TestAlias < Test::Unit::TestCase
     end
     assert_equal("ABC", x.try(:upcase), '[ruby-dev:38824]')
   end
+
+  def test_special_const_alias
+    assert_raise(TypeError) do
+      1.instance_eval do
+        alias to_string to_s
+      end
+    end
+  end
 end