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-rw-r--r--libguile/procprop.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/libguile/procprop.c b/libguile/procprop.c
index 8e2cd6a5f..428d63f91 100644
--- a/libguile/procprop.c
+++ b/libguile/procprop.c
@@ -1,5 +1,6 @@
-/* Copyright (C) 1995,1996,1998,2000,2001,2003,2004, 2006, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
- *
+/* Copyright (C) 1995, 1996, 1998, 2000, 2001, 2003, 2004, 2006,
+ * 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+ *
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
@@ -175,7 +176,7 @@ SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0
SCM_VALIDATE_PROC (1, proc);
#if (SCM_ENABLE_DEPRECATED == 1)
- if (scm_assq (alist, scm_sym_arity))
+ if (scm_is_true (scm_assq (scm_sym_arity, alist)))
SCM_MISC_ERROR ("arity is a read-only property", SCM_EOL);
#endif