class SyntaxTree::OpAssign

def format(q)
  q.group do
    q.format(target)
    q.text(" ")
    q.format(operator)
    if skip_indent?
      q.text(" ")
      q.format(value)
    else
      q.indent do
        q.breakable_space
        q.format(value)
      end
    end
  end
end