Delphi - E2058 Class, interface and object types only allowed in type section

Class and object types must always be stated in a type section with an explicit type declaration – they cannot be anonymous like record types.

The fundamental reason for this is that you wouldn’t be able to declare the methods of that type because there is no such thing as a type name.

program Produce;

var
  MyClass : class
    Field: Integer;
  end;

begin
end.

It is not permitted to specify a class type within a variable declaration, as shown in the example.

program Solve;

type
  TMyClass = class
    Field: Integer;
  end;

var
  MyClass : TMyClass;

begin
end.

The solution is to give the class type a type declaration. You may have changed the class type to a record type instead.

Delphi – E2058 Class, interface and object types only allowed in type section