--- Libc/Libc-1725.40.4/include/struct.h
+++ Libc/Libc-1272.200.26/include/struct.h
@@ -48,13 +48,6 @@
 #define	strbase(name, addr, field) \
 	((struct name *)((char *)(addr) - fldoff(name, field)))
 
-/*
- * 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]))
-
 /* Number of elements in a statically-defined array */
 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && __GNUC__
 #define countof(arr) ({ \
@@ -65,15 +58,11 @@
 })
 #else
 #define countof(arr) \
-	countof_unsafe(arr)
+	(sizeof(arr) / sizeof(arr[0]))
 #endif
 
 /* Length of a statically-defined string (does not include null terminator) */
 #define lenof(str) \
 	(sizeof(str) - 1)
 
-/* Last index of a statically-defined array */
-#define lastof(arr) \
-	(countof(arr) - 1)
-
 #endif /* !_STRUCT_H_ */