class RSpec::Mocks::MethodDouble

def remove_method_from_definition_target
  definition_target.__send__(:remove_method, @method_name)
rescue NameError
  # This can happen when the method has been monkeyed with by
  # something outside RSpec. This happens, for example, when
  # `file.write` has been stubbed, and then `file.reopen(other_io)`
  # is later called, as `File#reopen` appears to redefine `write`.
  #
  # Note: we could avoid rescuing this by checking
  # `definition_target.instance_method(@method_name).owner == definition_target`,
  # saving us from the cost of the expensive exception, but this error is
  # extremely rare (it was discovered on 2014-12-30, only happens on
  # RUBY_VERSION < 2.0 and our spec suite only hits this condition once),
  # so we'd rather avoid the cost of that check for every method double,
  # and risk the rare situation where this exception will get raised.
  RSpec.warn_with(
    "WARNING: RSpec could not fully restore #{@object.inspect}." \
    "#{@method_name}, possibly because the method has been redefined " \
    "by something outside of RSpec."
  )
end