~/oil/tools/xargs ~/oil
    delimiter ok
    delimiter_notrail ok
    eof ok
    max-args ok
    max-chars ok
    max-chars_exit ok
    max-chars_replace ok
    max-lines ok
    max-lines_whitespace ok
    max-procs ok
    no-run-if-empty_false ok
    no-run-if-empty_true ok
    null ok
    process-slot-var ok
    quoted_input ok
    replace ok
!!! replace_empty failed: files differ
--- EXPECTED ---
---- ACTUAL ----

----------------
!!! replace_empty_nostr failed: files differ
--- EXPECTED ---
---- ACTUAL ----
ok
----------------
    standard_whitespace ok
~/oil