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require 'active_support/core_ext/class/subclasses'
class Object
# Exclude this class unless it's a subclass of our supers and is defined.
# We check defined? in case we find a removed class that has yet to be
# garbage collected. This also fails for anonymous classes -- please
# submit a patch if you have a workaround.
def subclasses_of(*superclasses) #:nodoc:
Class.subclasses_of(*superclasses)
end
end
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