Add regression test for NameError#name

activesupport/lib/active_support/dependencies.rb

@@ -187,7 +187,7 @@ def const_missing(const_name)
       # top-level constant.
       def guess_for_anonymous(const_name)
         if Object.const_defined?(const_name)
-          raise NameError.new "#{const_name} cannot be autoloaded from an anonymous class or module", const_name
+          raise NameError.new "#{const_name} cannot be autoloaded from an anonymous class or module", const_name.to_s
         else
           Object
         end

activesupport/test/dependencies_test.rb

@@ -367,9 +367,11 @@ def test_non_existing_const_raises_name_error_with_fully_qualified_name
     with_autoloading_fixtures do
       e = assert_raise(NameError) { A::DoesNotExist.nil? }
       assert_equal "uninitialized constant A::DoesNotExist", e.message
+      assert_equal "A::DoesNotExist", e.name
 
       e = assert_raise(NameError) { A::B::DoesNotExist.nil? }
       assert_equal "uninitialized constant A::B::DoesNotExist", e.message
+      assert_equal "A::B::DoesNotExist", e.name
     end
   end
 
@@ -537,6 +539,7 @@ def test_const_missing_in_anonymous_modules_raises_if_the_constant_belongs_to_Ob
       mod = Module.new
       e = assert_raise(NameError) { mod::E }
       assert_equal 'E cannot be autoloaded from an anonymous class or module', e.message
+      assert_equal 'E', e.name
     end
   end
 
@@ -954,7 +957,7 @@ def test_access_unloaded_constants_for_reload
       assert_kind_of Class, A::B # Necessary to load A::B for the test
       ActiveSupport::Dependencies.mark_for_unload(A::B)
       ActiveSupport::Dependencies.remove_unloadable_constants!
-       
+
       A::B # Make sure no circular dependency error
     end
   end