Change for code review

src/cfront.c

@@ -1350,7 +1350,7 @@ int eval_expression_imm(opcode_t op, int op1, int op2)
         res = op1 >> op2;
         break;
     default:
-        error("Using operation not support");
+        error("The requested operation is not supported.");
     }
     return res;
 }