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-rw-r--r--generic/tclInt.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/generic/tclInt.h b/generic/tclInt.h
index ca565dd..e410a1d 100644
--- a/generic/tclInt.h
+++ b/generic/tclInt.h
@@ -2193,6 +2193,9 @@ typedef struct List {
* accomodate all elements. */
} List;
+#define LIST_MAX \
+ (1 + (int)(((size_t)UINT_MAX - sizeof(List))/sizeof(Tcl_Obj *)))
+
/*
* Macro used to get the elements of a list object.
*/