anchor.diff:  
   (in-root-suite)
   
  -(in-suite (defsuite test))
  +(defsuite (test :documentation "incf-cl test suite"))
  +
  +(in-suite test)
   
   (deftest test-range ()
     (signals error (range 1 -1))
  
positive.code: ;;; modify, merge, publish, distribute, sublicense, and/or sell copies
  ;;; of the Software, and to permit persons to whom the Software is
  ;;; furnished to do so, subject to the following conditions:
  ;;; 
  ;;; The above copyright notice and this permission notice shall be
  ;;; included in all copies or substantial portions of the Software.
  ;;; 
  ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  
negative.code: ;;; DEALINGS IN THE SOFTWARE.
  
  ;;; To run test coverage use:
  ;;;
  ;;; (progn
  ;;;   (require :sb-cover)
  ;;;   (declaim (optimize sb-cover:store-coverage-data))
  