variable type cast

gpc version 20070904, based on gcc-3.4.5 (mingw special)
 
     Given
          type INT16  = INTEGER  attribute( size=16 ) ;
          type WORD16 = Cardinal attribute( size=16 ) ;
          var i16 : INT16 ;
          var w16 : WORD16 ;
why does
          WORD16(I16) := W16 ;
produce "error: invalid lvalue in assignment"?

 
         

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program jsm5( input, output ) ;
type
  INT16  = INTEGER  attribute( size=16 ) ;
  WORD16 = Cardinal attribute( size=16 ) ;
var
  i16 : INT16 ;
  w16 : WORD16 ;
begin
WORD16(I16) := W16 ; { error: invalid lvalue in assignment }
end.