class RuboCop::Cop::Layout::IndentHeredoc

def check_style!
  case style
  when nil
    raise Warning, "Auto-correction does not work for #{cop_name}. " \
                   'Please configure EnforcedStyle.'
  when :squiggly
    if target_ruby_version < 2.3
      raise Warning, '`squiggly` style is selectable only on Ruby ' \
                     "2.3 or higher for #{cop_name}."
    end
  end
end