Cannot declare "LongInt = AnsiString" comparison operator

Original Reporter info from Mantis: kluug.net @onpok

• Reporter name: Ondrej Pokorny

Description:

When I want to declare "LongInt = AnsiString" comparison operator, the compiler tells me "Impossible operator overload" although it is documented to work.

http://lazarus-ccr.sourceforge.net/fpcdoc/ref/refse67.html#x156-16300012.5 :
&LtPos;i>The comparision operator can be overloaded to compare &LtPos;b>two different types&LtPos;/b> or to compare two equal types that are not basic types.&LtPos;/i>

Steps to reproduce:

Compile the following program:

program project1;

{$mode objfpc}{$H+}
{$modeswitch advancedrecords}

operator = (z1: LongInt; z2 : ansistring) b : boolean;
begin
  b := false;
end;

var
  i: longint;
  s: string;
begin
  writeln(i = s);
  readln;
end.

Mantis conversion info:

• Mantis ID: 29460
• Version: 3.1.1
• Fixed in version: 3.3.1
• Fixed in revision: 43709 (#2f374a37)