tests/properties.impure.lisp

   1 ;;;; miscellaneous tests of symbol properties
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; While most of SBCL is derived from the CMU CL system, the test
   7 ;;;; files (like this one) were written from scratch after the fork
   8 ;;;; from CMU CL.
   9 ;;;;
  10 ;;;; This software is in the public domain and is provided with
  11 ;;;; absolutely no warranty. See the COPYING and CREDITS files for
  12 ;;;; more information.
  13
  14 (in-package "CL-USER")
  15
  16 (defun test-symbol (symbol)
  17   (setf (symbol-plist symbol) nil)
  18   (setf (get symbol 'foo) '(my list))
  19   (setf (get symbol 'bar) 10)
  20   (setf (get symbol 'baz) t)
  21   (assert (eql (get symbol 'bar) 10))
  22   (assert (= (length (symbol-plist symbol)) 6))
  23   (remprop symbol 'foo)
  24   (assert (not (get symbol 'foo))))
  25 (mapc #'test-symbol '(foo :keyword || t nil))
  26 ;;; In early 0.7 versions on non-x86 ports, setting the property list
  27 ;;; of 'NIL would trash (CDR NIL), due to a screwup in the low-level
  28 ;;; layout of SYMBOL. (There are several low-level punnish tricks used
  29 ;;; to make NIL work both as a cons and as a symbol without requiring
  30 ;;; a lot of conditional branching at runtime.)
  31 (defparameter *nil-that-the-compiler-cannot-constant-fold* nil)
  32 (assert (not (car *nil-that-the-compiler-cannot-constant-fold*)))
  33 (assert (not (cdr *nil-that-the-compiler-cannot-constant-fold*)))
  34
  35 ;;; success