instiki/vendor/rails/activesupport/lib/active_support/core_ext/object/metaclass.rb

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class Object
# Get object's meta (ghost, eigenclass, singleton) class
def metaclass
class << self
self
end
end
# If class_eval is called on an object, add those methods to its metaclass
def class_eval(*args, &block)
metaclass.class_eval(*args, &block)
end
end