Is s[1..0] legitimate?

22 Apr 2003

      Is a zero length slice a legitimate structure?

Ie

var
   s, t: String(10);
begin
   if EQ( s[1..0], t[1..0] ) then begin
     WriteLn( 'TRUE' );
   end;
end.

Should that work?

Currently it gives

testpas.pas:6: size of array is too large

however, if the 0 is changed to a runtime variable:

var
   s, t: String(10);
   n: Integer;
begin
   n := 0;
   if EQ( s[1..n], t[1..n] ) then begin
     WriteLn( 'TRUE' );
   end;
end.

Then it returns TRUE (as expected, sort of).

Similarly for
   s := t[1..0];
etc.

So, is it legitimate or not?  If it is, the compile error is a bug. 
If not, then there seems to be a missing runtime range check error 
(or do I have to enable that)?

Thanks,
    Peter.

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Is s[1..0] legitimate?

Peter N Lewis