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-rw-r--r--libguile/variable.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/variable.h b/libguile/variable.h
index 8d4abc028..a8e9efc18 100644
--- a/libguile/variable.h
+++ b/libguile/variable.h
@@ -56,7 +56,7 @@
extern int scm_tc16_variable;
#define SCM_VARVCELL(V) SCM_CDR(V)
-#define SCM_VARIABLEP(X) (SCM_NIMP(X) && (scm_tc16_variable == SCM_UNPACK_CAR(X)))
+#define SCM_VARIABLEP(X) (!SCM_IMP (X) && SCM_CELL_TYPE (X) == scm_tc16_variable)
#define SCM_UDVARIABLEP(X) (SCM_VARIABLEP(X) && SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (X))))
#define SCM_DEFVARIABLEP(X) (SCM_VARIABLEP(X) && !SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (X))))