haskell-indent-put-region-in-literate-2 test fails withe emacs 27.1 (release candidate)

While testing haskell-mode with the Emacs 27.1 release candidate, the haskell-indent-put-region-in-literate-2 fails with the following log:

```
Making before-change-functions buffer-local while locally let-bound!
Test haskell-indent-put-region-in-literate-2 backtrace:
signal(error ("Can’t find the comment end"))
apply(signal (error ("Can’t find the comment end")))
(setq value-1067 (apply fn-1065 args-1066))
(unwind-protect (setq value-1067 (apply fn-1065 args-1066)) (setq fo
(if (unwind-protect (setq value-1067 (apply fn-1065 args-1066)) (set
(let (form-description-1069) (if (unwind-protect (setq value-1067 (a
(let ((value-1067 'ert-form-evaluation-aborted-1068)) (let (form-des
(let* ((fn-1065 #'equal) (args-1066 (condition-case err (let ((signa
(closure (t) nil (let* ((fn-1065 #'equal) (args-1066 (condition-case
ert--run-test-internal(#s(ert--test-execution-info :test #s(ert-test
ert-run-test(#s(ert-test :name haskell-indent-put-region-in-literate
ert-run-or-rerun-test(#s(ert--stats :selector t :tests ... :test-map
ert-run-tests(t #f(compiled-function (event-type &rest event-args) #
ert-run-tests-batch(nil)
ert-run-tests-batch-and-exit()
command-line-1(("--eval" "(when (boundp 'load-prefer-newer) (setq lo
command-line()
normal-top-level()
Test haskell-indent-put-region-in-literate-2 condition:
(error "Can’t find the comment end")
FAILED 200/532 haskell-indent-put-region-in-literate-2 (0.000351 sec)
```

I observed this with both the the 17.1 release and commit 41683c0e634bb3f54eac8747919a82132e1714fe.