Fun fact, in bash you lose the exit codes of process subs. It doesn't even wait() on those processes in many cases.

So there is no way to abort a bash script if something like <(sort nonexistent) fails.

OSH lets you opt into stricter behavior:

    $ osh -c 
    set -e
    shopt -s oil:basic

    diff <(sort left) <(sort nonexistent)
    echo "should not get here"'
    '
    sort: cannot read: nonexistent: No such file or directory

    diff <(sort left) <(sort nonexistent)
                      ^~
    [ -c flag ]:1: fatal: Exiting with status 2 (command in PID 29359)

In contrast, bash will just keep going and ignore failure.

You can also get all the exit codes with @_process_sub_status, which is analogous to PIPESTATUS.

(I should probably write a blog post about this: http://www.oilshell.org/blog/)