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{$mode objfpc}
{$apptype console}
type
T = class
stop: boolean;
F: Integer;
function MoveNext: Boolean;
property Current: Integer read F;
end;
Twice = type Integer;
function T.MoveNext: Boolean;
begin
Result := not stop;
stop := true;
end;
operator enumerator(a: Integer): T;
begin
Result := T.Create;
Result.F := a;
Result.stop := false;
end;
operator enumerator(a: Twice): T;
begin
Result := T.Create;
Result.F := a * 2;
Result.stop := false;
end;
var
i: Integer;
begin
for i in Twice(1) do
Writeln(i);
end.
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