anchor.diff:      perform code_test using '''a'.
       perform code_test using '''(list 1 2 3)'.
   
  +* Test DEFINE
  +    perform code_test using '(define 22 23)'. "Err
  +    perform code_test using '(define a 23)'.
  +    perform code_test using 'a'. "Err
  +
   * Test strings
       perform code_test using '"string value"'.
       perform code_test using '"string value with \" escaped double quote"'.
  
positive.code:     perform code_test using 'b'.
      perform code_test using '(b 20)'.
      perform code_test using '((lambda (a) (+ a 20)) 10 )'.
  
    endif.
  
  
negative.code:     perform code_test using '(if (< 2 1) 23)'.
      perform code_test using '(if (< 2 1) 23 24)'.
  
  * Test =
      perform code_test using '(= 2 3)'.
      perform code_test using '(= 3 3)'.
  
  * Test nil?
      perform code_test using '(nil? ())'.
  