[flang] Add missing symbol names to the error message (#148888)

Fixes #140485

Author: eugeneepshteyn

flang/lib/Semantics/resolve-names.cpp

@@ -8574,8 +8574,10 @@ bool ResolveNamesVisitor::Pre(const parser::ImportStmt &x) {
         } else {
           Say(name,
               "A distinct '%s' is already present in this scope"_err_en_US)
-              .Attach(symbol->name(), "Previous declaration of '%s'"_en_US)
-              .Attach(outer->name(), "Declaration of '%s' in host scope"_en_US);
+              .Attach(symbol->name(), "Previous declaration of '%s'"_en_US,
+                  symbol->name().ToString())
+              .Attach(outer->name(), "Declaration of '%s' in host scope"_en_US,
+                  outer->name().ToString());
         }
       }
     } else {