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-rw-r--r--generic/regguts.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/generic/regguts.h b/generic/regguts.h
index ac625d5..7ed8ec1 100644
--- a/generic/regguts.h
+++ b/generic/regguts.h
@@ -265,8 +265,10 @@ struct arc {
struct state *from; /* where it's from (and contained within) */
struct state *to; /* where it's to */
struct arc *outchain; /* *from's outs chain or free chain */
-#define freechain outchain
+ struct arc *outchainRev; /* back-link in *from's outs chain */
+#define freechain outchain /* we do not maintain "freechainRev" */
struct arc *inchain; /* *to's ins chain */
+ struct arc *inchainRev; /* back-link in *to's ins chain */
struct arc *colorchain; /* color's arc chain */
struct arc *colorchainRev; /* back-link in color's arc chain */
};