anchor.diff:  
   ;;; See default-implementations.lisp for MAKE-THREAD.
   
  -(defmacro defbindings (name docstring &body initforms)
  -  (check-type docstring string)
  -  `(defvar ,name
  -     (list
  -      ,@(loop for (special form) in initforms
  -              collect `(cons ',special ',form)))
  -     ,docstring))
  -
   ;; Forms are evaluated in the new thread or in the calling thread?
  -(defbindings *default-special-bindings*
  +(defvar *default-special-bindings*
     "This variable holds an alist associating special variable symbols
     to forms to evaluate. Special variables named in this list will
     be locally bound in the new thread before it begins executing user code.
  
positive.code:   undefined, but earlier forms take precedence over later forms for
    the same symbol, so defaults may be overridden by consing to the
    head of the list."
    (*package*                   (find-package :common-lisp-user))
    (*print-array*               t)
    (*print-base*                10)
  
negative.code:   in other more traditionally named packages.")
    (:use #:cl)
    (:export #:make-thread #:current-thread #:threadp #:thread-name
             #:*default-special-bindings* #:*standard-io-bindings*
             #:*supports-threads-p*
  
             #:make-lock #:acquire-lock #:release-lock #:with-lock-held
             #:make-recursive-lock #:acquire-recursive-lock
  