[fpc-pascal] why can't we define class operator for old fashion object type, but ok for 'advanced record' type?

[Dennis]

Michael Van Canneyt wrote:
>
>
> On Wed, 15 Aug 2018, Dennis wrote:
>
>> I was trying to use a generic class TDictionary<T>  with type T. This 
>> class has a method that compares a variable of T with another one.
>>
>> When I specialize a class using this TDictionary with a type:
>>
>> TSecurity = object
>>   ....
>> end;
>>
>>
>> e.g. TNewDict = class(TDictionary<String, TSecurity>);
>>
>> it raise a compiler complaining that my TSecurity type has no 
>> operator = defined.
>>
>> But when I try to add like this:
>>
>> TSecurity = object
>>   ....
>> class operator =  (constref aLeft, aRight: TSecurity ): Boolean; 
>> //<---compiler Error: Procedure or Function expected
>>
>> end;
>
> Did you try creating an "old-fashioned" = operator ?
>
> Something like
>
> Operator = (l,r : TSecurity) z : boolean;
>
> begin
>   // compare here
> end;
>

Just tried.
It complained:   Fatal: Syntax error, "IMPLEMENTATION" expected but 
"identifier OPERATOR" found

Dennis