Pointer Dereference Issue with array of pointers

[Schmitty2005]

{$MODE ObjFPC}
program pnt;
uses sysutils;
const
   BlkSize = 12;

TYPE
  BufBlock   = ARRAY [0 .. BlkSize-1] OF Integer;
  Buffer     = ARRAY [0 .. 31] OF ^BufBlock;
var
    buf : Buffer;
    blk : BufBlock;
    x : Integer;
begin
    
    blk[0]:= 2;
    buf[0] := @blk;
    buf[0]^[1] := 12;
    x := buf[0]^[1];
    writeln(x);
end.

Compiles and works in FPC, but in Blaise :

$ ./blaise --source pnt.pas --output pnt
Parse error: Expected '.' or ':=' after subscript at line 19 col 11 in pnt.pas