# define toCTRL(c) (toUPPER(c) ^ 64)
#endif
-/* Line numbers are unsigned, 16 bits. */
-typedef U16 line_t;
+/* Line numbers are unsigned, 32 bits. */
+typedef U32 line_t;
#ifdef lint
#define NOLINE ((line_t)0)
#else
-#define NOLINE ((line_t) 65535)
+#define NOLINE ((line_t) 4294967295UL)
#endif