Do not ignore return array size specifications in operator declarations, treat them as errors

Author: Daniel-Cortez

source/compiler/sc1.c

@@ -3812,6 +3812,8 @@ static void funcstub(int fnative)
   } /* if */
 
   if (tok==tOPERATOR) {
+    if (numdim!=0)
+      error(10);                /* invalid function or declaration */
     opertok=operatorname(symbolname);
     if (opertok==0)
       return;                   /* error message already given */