1 files changed, 4 insertions, 1 deletions

diff --git a/lgc.h b/lgc.h
index f571fd2b..0508cd1d 100644
--- a/lgc.h
+++ b/lgc.h
@@ -69,13 +69,16 @@
 
 /*
 ** Layout for bit use in 'marked' field. First three bits are
-** used for object "age" in generational mode.
+** used for object "age" in generational mode. Last bit is used
+** by tests.
 */
 #define WHITE0BIT       3  /* object is white (type 0) */
 #define WHITE1BIT       4  /* object is white (type 1) */
 #define BLACKBIT        5  /* object is black */
 #define FINALIZEDBIT    6  /* object has been marked for finalization */
 
+#define TESTBIT         7
+
 
 
 #define WHITEBITS       bit2mask(WHITE0BIT, WHITE1BIT)