Remove :stop key from make-process.

This has never worked and caused issues such as Bug#30460.

* src/process.c (Fmake_process): Don't accept :stop key any more.
(syms_of_process): Define needed symbol 'null'.

* test/src/process-tests.el (make-process/stop): New unit test.

* doc/lispref/processes.texi (Asynchronous Processes): Remove :stop
key from manual.

1 files changed, 9 insertions, 0 deletions

diff --git a/test/src/process-tests.el b/test/src/process-tests.el
index 0bb7ebe50a8..b853f77946d 100644
--- a/test/src/process-tests.el
+++ b/test/src/process-tests.el
@@ -284,5 +284,14 @@ file name handler."
 (put #'process-tests--file-handler 'operations
      '(unhandled-file-name-directory make-process))
 
+(ert-deftest make-process/stop ()
+  "Check that `make-process' doesn't accept a `:stop' key.
+See Bug#30460."
+  (should-error
+   (make-process :name "test"
+                 :command (list (expand-file-name invocation-name
+                                                  invocation-directory))
+                 :stop t)))
+
 (provide 'process-tests)
 ;; process-tests.el ends here.