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bug#24778: 25.1; cl-assert always calls the default debugger on assertio

From: David Shepherd
Subject: bug#24778: 25.1; cl-assert always calls the default debugger on assertion failures
Date: Sun, 23 Oct 2016 20:00:03 +0100

This causes problems with ert if you use cl-assert.

For example with the following saved in temp.el

    (require 'cl-macs)

    (ert-deftest cl-assert-failure ()
      (cl-assert (equal 1 2) "uh oh"))

and run with

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

(as recommended by the ert manual) the output is

    Running 1 tests (2016-10-23 19:48:21+0100)
    Debugger entered: ((cl-assertion-failed (equal 1 2) nil))
      cl--assertion-failed((equal 1 2))
      (or (equal 1 2) (cl--assertion-failed (quote (equal 1 2))))
      (progn (or (equal 1 2) (cl--assertion-failed (quote (equal 1 2)))) nil)

followed by a large backtrace. Whereas

    (ert-deftest normal-error-call ()
      (error "uh oh"))

gives the output

    Running 1 tests (2016-10-23 19:52:07+0100)
    Test normal-error-call backtrace:
      (lambda nil (error "uh oh"))()
      ert--run-test-internal([cl-struct-ert--test-execution-info [cl-struc
      ert-run-test([cl-struct-ert-test normal-error-call nil (lambda nil (
      ert-run-or-rerun-test([cl-struct-ert--stats t [[cl-struct-ert-test n
      ert-run-tests(t #[385 "\306\307\"address@hidden
      command-line-1(("-l" "ert" "-l" "temp.el" "-f" "ert-run-tests-batch-
    Test normal-error-call condition:
        (error "uh oh")
       FAILED  1/1  normal-error-call

    Ran 1 tests, 0 results as expected, 1 unexpected (2016-10-23 19:52:07+0100)

    1 unexpected results:
   FAILED  normal-error-call

Older versions of emacs gave something like the second output even when
cl-assert was used.

This doesn't seem to be an issue if ert tests are run interactively, I'm
not sure why.

Removing the lines

    (if debug-on-error
       (apply debugger `(cl-assertion-failed ,form ,string ,@sargs))

from cl--assertion-failed seems to solve the problem, but I don't know
if that would break other things.

In GNU Emacs 25.1.1 (x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2016-10-23 built on david-entroware
Repository revision: f0eb70d8935be90f7c03e187c12d9b60e7214cc6
Windowing system distributor 'The X.Org Foundation', version 11.0.11803000
System Description:    Ubuntu 16.04.1 LTS

Configured using:
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Configured features:

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Recent messages:
Saving file /home/david/code/espuds/test/espuds-test.el...
Wrote /home/david/code/espuds/test/espuds-test.el
(Cannot open load file: No such file or directory, f)
Mark set [2 times]
Saving file /home/david/code/espuds/test/test-helper.el...
Wrote /home/david/code/espuds/test/test-helper.el
Reverting buffer ‘espuds-test.el’.
Saving file /home/david/code/espuds/espuds.el...
Wrote /home/david/code/espuds/espuds.el

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