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program tforin3;
// check for-in loop if GetEnumerator returns nil
{$mode objfpc}{$H+}
{$APPTYPE CONSOLE}
type
{ TListEnumerator }
TListEnumerator = class
private
FCurrent: String;
public
function MoveNext: Boolean;
property Current: String read FCurrent;
end;
TMyList = class
public
function GetEnumerator: TListEnumerator;
end;
{ TListEnumerator }
function TListEnumerator.MoveNext: Boolean;
begin
Result := True;
end;
{ TMyList }
function TMyList.GetEnumerator: TListEnumerator;
begin
Result := nil;
end;
var
S: String;
L: TMyList;
begin
L := TMyList.Create;
for S in L do
;
L.Free;
end.
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