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fishでsubshellの出力を展開する方法

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bashの以下のコマンドをfishで実行するにはどうするか?

docker $(docker-machine config prl) ps

Using subshells to expand arguments
http://sourceforge.net/p/fish/mailman/message/33271083/

つまりこうすればよい

eval docker (docker-machine config prl) ps
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