diff options
Diffstat (limited to 'libguile/pairs.c')
-rw-r--r-- | libguile/pairs.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/libguile/pairs.c b/libguile/pairs.c index aaaeb110f..fb8b21f11 100644 --- a/libguile/pairs.c +++ b/libguile/pairs.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1995,1996,2000,2001, 2004, 2005, 2006, 2008 Free Software Foundation, Inc. +/* Copyright (C) 1995,1996,2000,2001, 2004, 2005, 2006, 2008, 2009 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 @@ -27,11 +27,25 @@ #include "libguile/pairs.h" +#include "verify.h" + /* {Pairs} */ +/* + * This compile-time test verifies the properties needed for the + * efficient test macro scm_is_null_or_nil defined in pairs.h, + * which is defined in terms of the SCM_MATCHES_BITS_IN_COMMON macro. + * + * See the comments preceeding the definitions of SCM_BOOL_F and + * SCM_MATCHES_BITS_IN_COMMON in tags.h for more information. + */ +verify (SCM_VALUES_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \ + (SCM_ELISP_NIL, SCM_EOL)); + + #if (SCM_DEBUG_PAIR_ACCESSES == 1) #include "libguile/ports.h" |