Code
{$mode objfpc}{$H+}
...
const
ar: array of string = ('a','b');
procedure TForm1.FormCreate(Sender: TObject);
var
s: string;
begin
s:= 'a';
if s in ar then ;
end;
FPC error: "Operator is not overloaded".
Lazarus 2.3.0 r65368M FPC 3.2.1 x86_64-linux-gtk2
When this "in" must work?