anchor.diff:  				  ;bg
   				  ("cd" . make-utility)
   				  ;command
  -				  ;false
  +				  ("false" . make-utility)
   				  ;fc
   				  ;fg
  -				  ;getopts
  +				  ("getopts" . make-utility)
   				  ("jobs" . make-utility)
   				  ;kill
   				  ;newgrp
   				  ;pwd
   				  ;read
  -				  ;true
  +				  ("true" . make-utility)
   				  ("umask" . make-utility)
   				  ;unalias
   				  ;wait
  
positive.code: 
  ;TODO stub
  (defun init-subshell ()
    (warn "STUB: init-subshell"))
  
  (defmacro with-subshell ((&optional wait) &body b)
  
negative.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 0)
       do
         (cond
  	 ((isys:wifexited stat)
  