I wonder whether anybody could throw some light on a curious error. I've just tried to move a class definition into the interface part of a unit, so that I could easily add a class helper, but I'm getting an error

borgumserverinterface.pas(927,24) Error: (3048) function header doesn't match any method of this class
"TzzConnection.ExecuteSQL2(TStringList,Boolean="FALSE"):Boolean;"

If I move the class back into the implementation part there's no error. Simplified code as below:

interface
uses
   Classes, SysUtils, StrUtils, BorgUMFingerD, BorgUMCode, sqldb;
type
         TzzConnection= class(TObject)
..
           public
..
             function ExecuteSQL2(sl: TStringList;
                 relaxInuseCheck: boolean= false): boolean;
..
implementation
uses pqconnection, ibconnection, Custom, postgres3dyn, ibase60dyn, Regexpr;
..
function TzzConnection.ExecuteSQL2(sl: TStringList; relaxInuseCheck:
boolean= false): boolean;
..

It's that final declaration that goes wrong, but I can fix it by moving the class back into the implementation part. FPC 2.6.2 on Linux x86.

Once upon a time, Mark Morgan Lloyd said:

Just and idea: Can it be that you redefined TStringList (or boolean for that matter, but that doesn't strike me as obvious) in oneof the units you used in your implementation section?

The simplified code also fails? Removing the default parameter value from the implementation makes any difference?

-Flávio

Ewald got it right: I'd defined myself a custom TStringList for reasons that seemed sensible at the time.

I haven't... I'm sure I wouldn't be that stupid... oh bother.

Guilty as charged. I'd defined Custom.TStringList with a non-standard Append2 method which appended a fragment to the last line. It builds if I convert that to a class helper, but I haven't tested yet.

Thanks for your help and everybody's patience.