Subject: bug#65156: 29.1; Reading from pipe with --insert or insert-file-contents no longer supported

From: Mattias Engdegård <[email-masked]>
Date: Wed, 9 Aug 2023 10:07:55 +0200

The current (4767f5eaee) code on emacs-29 fails fileio-tests with:

Test fileio-tests--non-regular-insert condition:
    (ert-test-failed
     ((should-error
       (insert-file-contents "/dev/urandom" nil 5 10))
      :form
      (insert-file-contents "/dev/urandom" nil 5 10)
      :value
      ("/dev/urandom" 5)
      :fail-reason "did not signal an error"))