Not supported while loop inside "initial" block

[iv2nl0b9v]

Repro:

module while_loop_inside_initial();
  initial begin
    integer a = 3;
    while (a > 1) begin
      a = a - 1;
    end
  end
endmodule : while_loop_inside_initial

Error:
ERROR: While loops are only allowed in constant functions!

While loop is not supported inside non-synthesizeable inside block.