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-rw-r--r--libguile/weaks.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libguile/weaks.h b/libguile/weaks.h
index f9130aed3..cedfbc6c0 100644
--- a/libguile/weaks.h
+++ b/libguile/weaks.h
@@ -54,6 +54,7 @@
#define SCM_IS_WHVEC_V(X) (SCM_VELTS(X)[-1] == 2)
#define SCM_IS_WHVEC_B(X) (SCM_VELTS(X)[-1] == 3)
#define SCM_IS_WHVEC_ANY(X) (SCM_VELTS(X)[-1])
+#define SCM_WVECT_GC_CHAIN(X) (SCM_VELTS(X)[-2])