[stevelosh]

The anonymous pipes are also called "process substitution", and are done with `psub` in fish:

    sjl at alephnull in ~/scratch/tmp
    ><((°> diff -U0 (ls -1 | psub) (ls -1 | grep -v foo | psub)
    --- /tmp/.psub.cIcXKeQj3O       2019-10-10 10:21:58.940444840 -0400
    +++ /tmp/.psub.7W6mBnxcQD       2019-10-10 10:21:58.952444799 -0400
    @@ -3 +2,0 @@
    -foo

[mFixman]

Amazing, this is exactly what I was looking for. Thanks!