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-rw-r--r--libguile/hooks.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/libguile/hooks.h b/libguile/hooks.h
index 8b89eaa5e..c61a292fd 100644
--- a/libguile/hooks.h
+++ b/libguile/hooks.h
@@ -96,8 +96,8 @@ extern void *scm_c_hook_run (scm_c_hook_t *hook, void *data);
* Scheme level hooks
*/
-#define SCM_HOOKP(x) (SCM_NIMP(x) && (SCM_TYP16 (x) == scm_tc16_hook))
-#define SCM_HOOK_ARITY(hook) (SCM_UNPACK_CAR (hook) >> 16)
+#define SCM_HOOKP(x) (!SCM_IMP (x) && (SCM_TYP16 (x) == scm_tc16_hook))
+#define SCM_HOOK_ARITY(hook) (SCM_CELL_WORD_0 (hook) >> 16)
#define SCM_HOOK_NAME(hook) SCM_CADR (hook)
#define SCM_HOOK_PROCEDURES(hook) SCM_CDDR (hook)
#define SCM_SET_HOOK_PROCEDURES(hook, procs) SCM_SETCDR (SCM_CDR (hook), procs)