--- lsys/util.h	2008/11/06 14:31:24	1.1
+++ lsys/util.h	2018/11/07 12:50:17	1.2
@@ -17,8 +17,8 @@
 /* these defines belongs into config.h */
 #define abstract = 0
 
-#define t_no throw ()
-#define t_err throw (error)
+#define t_no noexcept
+#define t_err // can only throw error
 
 inline bool equal (double a, double b)
 {
@@ -149,7 +149,7 @@
     { };
    
    template<typename T>
-   error &operator <<(const T &s) const t_no
+   error &operator <<(const T &s) t_no
      { msg.append (s); return *this; };
 };