Emoji brings down hello-world example

If you put this program into the interactive hello-world compiler box, it apparently crashes. Changing the program again seems to still work, so I'm not sure this is really a problem.

with Ada.Text_IO; use Ada.Text_IO;

procedure Greet is
   Message : String (1 .. 4) := "😊";
   --        ^ Pre-defined array type.
   --          Component type is Character
begin
   for I in reverse Message'Range loop
      --    ^ Iterate in reverse order
      Put (Message (I));
   end loop;
   New_Line;
end Greet;

The error message is:

$ ./greet
The machine running the examples may not be available or is busy, please try again now or come back later.

Start with the interactive hello-world compiler box linked in the report and reproduce the Ada program containing the emoji string. Inspect what happens when it is compiled or run, including whether the box remains usable afterward; the issue is done when the emoji case no longer brings down the example or the failure is reported safely.