--- Libc/Libc-1353.11.2/include/struct.h
+++ Libc/Libc-1272.250.1/include/struct.h
@@ -61,13 +61,6 @@
 	(sizeof(arr) / sizeof(arr[0]))
 #endif
 
-/*
- * countof() cannot be safely used in a _Static_assert statement, so we provide
- * an unsafe variant that does not verify the input array is statically-defined.
- */
-#define countof_unsafe(arr) \
-	(sizeof(arr) / sizeof(arr[0]))
-
 /* Length of a statically-defined string (does not include null terminator) */
 #define lenof(str) \
 	(sizeof(str) - 1)