print_error_message can throw after producing some output, so use
unwind-protect to ensure prin1-to-string-buffer is cleared.

* src/print.c (erase_prin1_to_string_buffer): New.
(Ferror_message_string): Use it to catch errors thrown in
'print_error_message'.
* test/src/print-tests.el (error-message-string-circular): Expand
test.

* src/fileio.c (Finsert_file_contents): Inhibit ask-supersession
only if we're VISITing in a non-narrowed buffer (bug#78866).

* test/src/fileio-tests.el (ert--tests-dir): New var.
(fileio-tests--insert-file-contents-supersession): New test.

* test/src/treesit-tests.el (treesit--ert-test-defun-navigation):
Replace 'treesit-defun-type-regexp' with
'(or treesit-defun-type-regexp 'defun)' that fixes the tests
for ts-modes that set up the 'defun' thing instead of
'treesit-defun-type-regexp'.

* test/src/comp-resources/comp-test-funcs.el (comp-test-76573-1-f): New
function.
* lisp/emacs-lisp/comp-cstr.el (comp-supertypes): Don't error if 'type'
is unknown.

* src/profiler.c (export_log): Check if a log has been allocated first,
and return nil if it hasn't.
(Fprofiler_cpu_log, Fprofiler_memory_log): Doc fix.
* test/src/profiler-tests.el (profiler-tests-cpu-profiler)
(profiler-tests-memory-profiler): New tests.

* test/lisp/emacs-lisp/lisp-tests.el (c-e-x, c-e-l):
Move to data-tests.el.
(core-elisp-tests-2-window-configurations): Rename ...
(core-elisp-tests-1-window-configurations): ... to this.
(core-elisp-tests-3-backquote): Rename ...
(core-elisp-tests-2-backquote): ... to this.
(core-elisp-tests-1-defvar-in-let)
(core-elisp-tests-4-toplevel-values): Move and rename ...
* test/src/data-tests.el (binding-test-defvar-in-let)
(binding-test-toplevel-values): ... to these.
(c-e-x, c-e-l): Moved from data-tests.el.

* src/print.c (print_string_1): Renamed from 'print_string', with an
extra argument to disable nonascii escaping.
(print_string): New function.
(print_object): Use 'print_string_1', not 'strout'.

* test/src/filelock-tests.el (filelock-tests-file-locked-p-spoiled)
(filelock-tests-unlock-spoiled)
(filelock-tests-kill-buffer-spoiled): Don't special-case
MS-Windows, as it was evidently fixed to signal the same error as
Posix systems.

* test/src/fileio-tests.el
(fileio-tests-w32-time-stamp-granularity): New test.

* test/src/treesit-tests.el (treesit-parse-string)
(treesit-parser-tracking-line-column-p)
(treesit-tracking-line-column-p, treesit--linecol-at)
(treesit--linecol-cache-set, treesit--linecol-cache)
(treesit-languages-require-line-column-tracking): Declare.