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-rw-r--r--src/alloc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/alloc.c b/src/alloc.c
index 5776a2be92..29e0ab46ea 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -118,6 +118,10 @@ Lisp_Object memory_signal_data;
#define DONT_COPY_FLAG 1
#endif /* no DONT_COPY_FLAG */
+#if DONT_COPY_FLAG == MARKBIT
+you lose
+#endif
+
/* Buffer in which we save a copy of the C stack at each GC. */
char *stack_copy;