--- stack/stack.h	2002/03/10 09:13:36	1.8
+++ stack/stack.h	2002/03/10 10:06:36	1.9
@@ -35,8 +35,13 @@
     list
   } type:4;			/* Type of stack element */
 
-  int gc_garb:1;
-  int gc_protect:1;
+  union {
+    struct {
+      unsigned int mark:1;
+      unsigned int protect:1;
+    } flag;
+    unsigned int no_gc:2;
+  } gc;
 
   union {
     void *ptr;			/* Pointer to the content */