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class Object
# Returns true if this object is included in the argument. Argument must be
# any object which respond to +#include?+. Usage:
#
# characters = ["Konata", "Kagami", "Tsukasa"]
# "Konata".in?(characters) # => true
#
def in?(another_object)
raise ArgumentError.new("You must supply another object that responds to include?") unless another_object.respond_to?(:include?)
another_object.include?(self)
end
end
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