find-shared-objects is busted for multiple references.

diff --git a/tests/check.scm b/tests/check.scm
index 53dd887b934da638df2392b219957237a8f91a61..536dc94ba6b86a1f5b478260ae85289a912346bf 100644 (file)
--- a/tests/check.scm
+++ b/tests/check.scm
@@ -86,6 +86,7 @@ USA.
     "runtime/test-pp"
     "runtime/test-predicate"
     ("runtime/test-predicate-dispatch" (runtime predicate-dispatch))
+    ("runtime/test-printer" (runtime printer))
     "runtime/test-process"
     "runtime/test-random"
     "runtime/test-readwrite"

diff --git a/tests/runtime/test-printer.scm b/tests/runtime/test-printer.scm
new file mode 100644 (file)
index 0000000..e95d971
--- /dev/null
+++ b/tests/runtime/test-printer.scm
@@ -0,0 +1,49 @@
+#| -*-Scheme-*-
+
+Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
+    2017, 2018 Massachusetts Institute of Technology
+
+This file is part of MIT/GNU Scheme.
+
+MIT/GNU Scheme is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+MIT/GNU Scheme is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with MIT/GNU Scheme; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
+USA.
+
+|#
+
+;;;; Tests of the printer
+;;; package: (runtime printer)
+
+(declare (usual-integrations))
+\f
+(define-test 'find-shared-objects/shared-once
+  (lambda ()
+    (let ((c (cons 0 0)))
+      (set-cdr! c c)
+      (let ((s (find-shared-objects c)))
+        (assert-= (length s) 1)
+        (assert-eq (car s) c)))))
+
+(define-test 'find-shared-objects/shared-twice
+  (lambda ()
+    (let ((c (cons 0 0)))
+      (set-car! c c)
+      (set-cdr! c c)
+      (let ((s (find-shared-objects c)))
+        (expect-failure
+         (lambda ()
+           (assert-= (length s) 1)
+           (assert-eq (car s) c)))))))