Fix a bug that class variable can't be referenced from class method

Class method defined in singleton class should be evaluated in class
context not singleton class context.

fix #2515

1 files changed, 13 insertions, 0 deletions

diff --git a/test/t/class.rb b/test/t/class.rb
index f49ccf494..d4ecf99d0 100644
--- a/test/t/class.rb
+++ b/test/t/class.rb
@@ -370,3 +370,16 @@ assert('clone Class') do
 
   Foo.clone.new.func
 end
+
+assert('class variable and class << self style class method') do
+  class ClassVariableTest
+    @@class_variable = "value"
+    class << self
+      def class_variable
+        @@class_variable
+      end
+    end
+  end
+
+  assert_equal("value", ClassVariableTest.class_variable)
+end