In a type section of your delphi program, class or interface types must always be stated with an explicit type declaration. They cannot be anonymous, unlike other record kinds.
The key reason for this is that you wouldn’t be able to declare the type’s methods otherwise (since there is no type name).
Attempting to declare a class type within a variable declaration is incorrect:
program Produce; var MyClass : class Field: Integer; end; begin end.
How to fix it?
program Solve; type TMyClass = class Field: Integer; end; var MyClass : TMyClass; begin end.