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class method

Singleton.append_features

append_features(mod)

# File tmp/rubies/ruby-3.1.3/lib/singleton.rb, line 154
def append_features(mod)
  #  help out people counting on transitive mixins
  unless mod.instance_of?(Class)
    raise TypeError, "Inclusion of the OO-Singleton module in module #{mod}"
  end
  super
end

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See also .included .instance also in 3.3 · 3.2 · 3.0

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