Do you mean that you want `cmd2 <(cmd1)` as a synonym for `cmd1 | cmd2`? In that case, I’m happy it doesn’t; it drastically lowers readability compared to left-to-right command pipelines, and I don’t see what value it adds.
Think "diff <(something) <(other)" without using temporary files.
However this can be fragile in bash script since any sub shell command can fail. I am still wandering how to support it in this rust_cmd_lib library.