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bug#51177: 29.0.50; stop-process on pipes

From: Helmut Eller
Subject: bug#51177: 29.0.50; stop-process on pipes
Date: Sat, 16 Oct 2021 18:24:02 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

On Thu, Oct 14 2021, Lars Ingebrigtsen wrote:

> Helmut Eller <eller.helmut@gmail.com> writes:
>> I did not read the docstring but I did read the manual.  This feature is
>> not described in the manual.  At least not near set-process-filter.
> Yup.  I've now documented the t value in the manual in emacs-28.

The t value also doesn't seem be handled correctly by make-process:

(ert-deftest test-filter=t ()
  (let ((p (make-process :command '("dd" "if=/dev/zero" "count=0")
                         :name "foo"
                         :filter t)))
    ;;(set-process-filter p t)
    (while (eq (process-status p) 'run)
      (accept-process-output p))))

when executed with

  emacs -Q --batch -l test.el -f ert-run-tests-batch-and-exit


Running 1 tests (2021-10-16 18:21:53+0200, selector ‘t’)
Test test-filter=t backtrace:
  t(#<process foo> "0+0 records in\n0+0 records out\n")
  accept-process-output(#<process foo>)
  (while (eq (process-status p) 'run) (accept-process-output p))
  (let ((p (make-process :command '("dd" "if=/dev/zero" "count=0") :na
  (lambda nil (let ((p (make-process :command '("dd" "if=/dev/zero" "c
  ert--run-test-internal(#s(ert--test-execution-info :test #s(ert-test
  ert-run-test(#s(ert-test :name test-filter=t :documentation nil :bod
  ert-run-or-rerun-test(#s(ert--stats :selector t :tests [#s(ert-test 
  ert-run-tests(t #f(compiled-function (event-type &rest event-args) #
  command-line-1(("-l" "test.el" "-f" "ert-run-tests-batch-and-exit"))
Test test-filter=t condition:
    (void-function t)
   FAILED  1/1  test-filter=t (0.001650 sec)

Ran 1 tests, 0 results as expected, 1 unexpected (2021-10-16 18:21:53+0200, 
0.115393 sec)

1 unexpected results:
   FAILED  test-filter=t


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