Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.

--- a/anagram/agcore/symbol.cpp	Mon May 30 23:32:56 2022 -0400
+++ b/anagram/agcore/symbol.cpp	Mon May 30 23:46:22 2022 -0400
@@ -22,6 +22,10 @@
   // Nothing to do
 }
 
+void Symbol::operator = (const Symbol &t) {
+  KeyedObjectRegister<SymbolDescriptor>::operator = (t);
+}
+
 void Symbol::reset() {
   LOGSECTION("Symbol::reset");
   KeyedObjectRegister<SymbolDescriptor>::reset();