class RuboCop::Cop::Lint::Void

def check_var(node)
  return unless node.variable? || node.const_type?
  if node.const_type?
    template = node.special_keyword? ? VAR_MSG : CONST_MSG
    offense_range = node
    message = format(template, var: node.source)
  else
    offense_range = node.loc.name
    message = format(VAR_MSG, var: node.loc.name.source)
  end
  add_offense(offense_range, message: message) do |corrector|
    autocorrect_void_expression(corrector, node)
  end
end