schema pointer compatibility

     Why isn't the address of an object of a schema type an acceptable
value for a pointer to the (undiscriminated) schema type?

type sptr_type = ^ string ;
type sptr_array_type( n : integer ) = array [ 1 .. n ] of sptr_type ;
type sptr_array_ptr_type = ^ sptr_array_type ;

const s1 = 's1' ;
const s2 = 's2' ;
const s3 = 's3' ;

const slist : sptr_array_type(3) = ( @s1, @s2, @s3 ) ;

var slist_ptr : sptr_array_ptr_type = @slist ;


t12.pas:23: error: assignment from incompatible pointer type


     I got the same error when I changed "slist" (the object of the
discriminated schema type) from a "const" to a "var".
     I got the same error when I tried using an assignment statement:

          var slp : sptr_array_ptr_type ;
          ...
          slp := @slist ;

     If a discriminated instance of a schema type isn't quite the
same type as the undiscriminated type, then when would I ever be
able to use the address of an object as a value for a pointer to
the undiscriminated type?  (without coercion, that is)

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