class SyntaxTree::RAssign

def format(q)
  q.group do
    q.format(value)
    q.text(" ")
    q.format(operator)
    case pattern
    when AryPtn, FndPtn, HshPtn
      q.text(" ")
      q.format(pattern)
    else
      q.group do
        q.indent do
          q.breakable_space
          q.format(pattern)
        end
      end
    end
  end
end