moves Object#singleton_class to Kernel#singleton_class to match Ruby also there, same for #class_eval to simplify, and adds coverage for class_eval

1 files changed, 13 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/kernel/singleton_class.rb b/activesupport/lib/active_support/core_ext/kernel/singleton_class.rb
new file mode 100644
index 0000000000..33612155fb
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/kernel/singleton_class.rb
@@ -0,0 +1,13 @@
+module Kernel
+  # Returns the object's singleton class.
+  def singleton_class
+    class << self
+      self
+    end
+  end unless respond_to?(:singleton_class) # exists in 1.9.2
+
+  # class_eval on an object acts like singleton_class.class_eval.
+  def class_eval(*args, &block)
+    singleton_class.class_eval(*args, &block)
+  end
+end