class SyntaxTree::PrettyPrintVisitor

def pairs(_name, values)
  q.group(2, "(", ")") do
    q.seplist(values) do |(key, value)|
      q.pp(key)
      if value
        q.text("=")
        q.group(2) do
          q.breakable("")
          q.pp(value)
        end
      end
    end
  end
end