warnings from Visual C++

llex.c

@@ -1,5 +1,5 @@
 /*
-** $Id: llex.c,v 1.40 1999/10/04 17:51:04 roberto Exp roberto $
+** $Id: llex.c,v 1.41 1999/10/11 16:13:42 roberto Exp roberto $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
@@ -37,7 +37,7 @@ void luaX_init (void) {
   int i;
   for (i=0; i<(sizeof(reserved)/sizeof(reserved[0])); i++) {
     TaggedString *ts = luaS_new(reserved[i]);
-    ts->marked = RESERVEDMARK+i;  /* reserved word */
+    ts->marked = (unsigned char)(RESERVEDMARK+i);  /* reserved word */
   }
 }