(* ...
The value of this test is questionable: calling an expired closure does not
have defined behaviour, since the structures needed to make the call may
have been garbage collected.
*)
and there's even less value in the test than there once was, since it's now reliably broken in practice on macOS.
As the comment says:
and there's even less value in the test than there once was, since it's now reliably broken in practice on macOS.