anchor.diff:  
   ;TODO stub
   (defun init-subshell ()
  +  (setf (iolib/os:environment-variable "OPTIND") "1")
     (warn "STUB: init-subshell"))
   
   (defmacro with-subshell ((&optional wait) &body b)
  
positive.code: (defun reap-children (se)
    (loop for (job-id . pid) in (hash-table-alist (se-bg-jobs se))
       for stat = (and pid (isys:waitpid pid isys:wnohang))
       if stat
       do
         (cond
  	 ((isys:wifexited stat)
  
negative.code:                     (setf iolib/pathnames:*default-file-path-defaults* abspath)
                      0)
                    (iolib/syscalls:enoent (v) (declare (ignore v)) 127))))
  	   (:|false|
  	     (false-command ut))
  	   (:|getopts|
  	     (getopts-command ut))
  	   (:|jobs|
  	     (jobs-command ut))
  	   (:|true|
  	     (true-command ut))
  	   (:|umask|
  	     (umask-command ut))
  	   (:|[|
  