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class Foo def self.settings_map @@settings_map ||= {} end def self.register_setting_get(name, &block) settings_map[name] ||= {} settings_map[name][:getter] = block end end class Bar class << self def settings_map @@settings_map ||= {} end def register_setting_get(name, &block) settings_map[name] ||= {} settings_map[name][:getter] = block end end end # Works on MRI and Rubinius Foo.register_setting_get(:blah) # Fails on Rubinius, works on MRI Bar.register_setting_get(:blah)