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[nongnu] elpa/macrostep 22c10f970f 09/10: Delete bundled cl-lib.el and e


From: ELPA Syncer
Subject: [nongnu] elpa/macrostep 22c10f970f 09/10: Delete bundled cl-lib.el and ert.el
Date: Wed, 26 Oct 2022 09:59:22 -0400 (EDT)

branch: elpa/macrostep
commit 22c10f970fd9a28cc94f9c8236b5390037c571a7
Author: Stefan Kangas <stefankangas@gmail.com>
Commit: Stefan Kangas <stefankangas@gmail.com>

    Delete bundled cl-lib.el and ert.el
---
 lib/.nosearch |    1 -
 lib/cl-lib.el |  410 ----------
 lib/ert.el    | 2544 ---------------------------------------------------------
 3 files changed, 2955 deletions(-)

diff --git a/lib/.nosearch b/lib/.nosearch
deleted file mode 100644
index 8b13789179..0000000000
--- a/lib/.nosearch
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/lib/cl-lib.el b/lib/cl-lib.el
deleted file mode 100644
index ce11309fda..0000000000
--- a/lib/cl-lib.el
+++ /dev/null
@@ -1,410 +0,0 @@
-;;; cl-lib.el --- Properly prefixed CL functions and macros  -*- coding: utf-8 
-*-
-
-;; Copyright (C) 2012, 2013, 2014  Free Software Foundation, Inc.
-
-;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
-;; vcomment: Emacs-24.3's version is 1.0 so this has to stay below.
-;; Version: 0.5
-
-;; This program is free software; you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation, either version 3 of the License, or
-;; (at your option) any later version.
-
-;; This program is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;; This is a forward compatibility package, which provides (a subset of) the
-;; features of the cl-lib package introduced in Emacs-24.3, for use on
-;; previous emacsen.
-
-;; Make sure this is installed *late* in your `load-path`, i.e. after Emacs's
-;; built-in .../lisp/emacs-lisp directory, so that if/when you upgrade to
-;; Emacs-24.3, the built-in version of the file will take precedence, otherwise
-;; you could get into trouble (although we try to hack our way around the
-;; problem in case it happens).
-
-;; This code is largely copied from Emacs-24.3's cl.el, with the alias bindings
-;; simply reversed.
-
-;;; Code:
-
-;; We need to handle the situation where this package is used with an Emacs
-;; that comes with a real cl-lib (i.e. ≥24.3).
-
-;; First line of defense: try to make sure the built-in cl-lib comes earlier in
-;; load-path so we never get loaded:
-;;;###autoload (let ((d (file-name-directory #$)))
-;;;###autoload   (when (member d load-path)
-;;;###autoload     (setq load-path (append (remove d load-path) (list d)))))
-
-(when (functionp 'macroexp--compiler-macro)
-  ;; `macroexp--compiler-macro' was introduced as part of the big CL
-  ;; reorganization which moved/reimplemented some of CL into core (mostly the
-  ;; setf and compiler-macro support), so its presence indicates we're running
-  ;; in an Emacs that comes with the new cl-lib.el, where this file should
-  ;; never be loaded!
-  (message "Real cl-lib shadowed by compatibility cl-lib? (%s)" load-file-name)
-  (when load-file-name
-    ;; (message "Let's try to patch things up")
-    (let ((loaddir (file-name-directory load-file-name))
-          load-path-dir)
-      ;; Find the problematic directory from load-path.
-      (dolist (dir load-path)
-        (if (equal loaddir (expand-file-name (file-name-as-directory dir)))
-            (setq load-path-dir dir)))
-      (when load-path-dir
-        ;; (message "Let's move the offending dir to the end")
-        (setq load-path (append (remove load-path-dir load-path)
-                                (list load-path-dir)))
-        ;; Here we could manually load cl-lib and then return immediately.
-        ;; But Emacs currently doesn't provide any way for a file to "return
-        ;; immediately", so instead we make sure the rest of the file does not
-        ;; throw away any pre-existing definition.
-        ))))
-
-(require 'cl)
-
-;; Some of Emacs-24.3's cl.el definition are not just aliases, because either
-;; the feature was dropped from cl-lib.el or because the cl-lib version is
-;; not fully compatible.
-;; Let's just not include them here, since it is very important that if code
-;; works with this cl-lib.el it should also work with Emacs-24.3's cl-lib.el,
-;; whereas the reverse is much less important.
-
-(dolist (var '(
-               ;; loop-result-var
-               ;; loop-result
-               ;; loop-initially
-               ;; loop-finally
-               ;; loop-bindings
-               ;; loop-args
-               ;; bind-inits
-               ;; bind-block
-               ;; lambda-list-keywords
-               float-negative-epsilon
-               float-epsilon
-               least-negative-normalized-float
-               least-positive-normalized-float
-               least-negative-float
-               least-positive-float
-               most-negative-float
-               most-positive-float
-               ;; custom-print-functions
-               ))
-  (let ((new (intern (format "cl-%s" var))))
-    (unless (boundp new) (defvaralias new var))))
-
-;; The following cl-lib functions were already defined in the old cl.el,
-;; with a different meaning:
-;; - cl-position and cl-delete-duplicates
-;;   the two meanings are clearly different, but we can distinguish which was
-;;   meant by looking at the arguments.
-;; - cl-member
-;;   the old meaning hasn't been used for a long time and is a subset of the
-;;   new, so we can simply override it.
-;; - cl-adjoin
-;;   the old meaning is actually the same as the new except for optimizations.
-
-(dolist (fun '(
-               (get* . cl-get)
-               (random* . cl-random)
-               (rem* . cl-rem)
-               (mod* . cl-mod)
-               (round* . cl-round)
-               (truncate* . cl-truncate)
-               (ceiling* . cl-ceiling)
-               (floor* . cl-floor)
-               (rassoc* . cl-rassoc)
-               (assoc* . cl-assoc)
-               ;; (member* . cl-member) ;Handle specially below.
-               (delete* . cl-delete)
-               (remove* . cl-remove)
-               (defsubst* . cl-defsubst)
-               (sort* . cl-sort)
-               (function* . cl-function)
-               (defmacro* . cl-defmacro)
-               (defun* . cl-defun)
-               (mapcar* . cl-mapcar)
-
-               remprop
-               getf
-               tailp
-               list-length
-               nreconc
-               revappend
-               concatenate
-               subseq
-               random-state-p
-               make-random-state
-               signum
-               isqrt
-               lcm
-               gcd
-               notevery
-               notany
-               every
-               some
-               mapcon
-               mapcan
-               mapl
-               maplist
-               map
-               equalp
-               coerce
-               tree-equal
-               nsublis
-               sublis
-               nsubst-if-not
-               nsubst-if
-               nsubst
-               subst-if-not
-               subst-if
-               subsetp
-               nset-exclusive-or
-               set-exclusive-or
-               nset-difference
-               set-difference
-               nintersection
-               intersection
-               nunion
-               union
-               rassoc-if-not
-               rassoc-if
-               assoc-if-not
-               assoc-if
-               member-if-not
-               member-if
-               merge
-               stable-sort
-               search
-               mismatch
-               count-if-not
-               count-if
-               count
-               position-if-not
-               position-if
-               ;; position ;Handle specially via defadvice below.
-               find-if-not
-               find-if
-               find
-               nsubstitute-if-not
-               nsubstitute-if
-               nsubstitute
-               substitute-if-not
-               substitute-if
-               substitute
-               ;; delete-duplicates ;Handle specially via defadvice below.
-               remove-duplicates
-               delete-if-not
-               delete-if
-               remove-if-not
-               remove-if
-               replace
-               fill
-               reduce
-               compiler-macroexpand
-               define-compiler-macro
-               assert
-               check-type
-               typep
-               deftype
-               defstruct
-               callf2
-               callf
-               letf*
-               letf
-               rotatef
-               shiftf
-               remf
-               psetf
-               declare
-               the
-               locally
-               multiple-value-setq
-               multiple-value-bind
-               symbol-macrolet
-               macrolet
-               progv
-               psetq
-               do-all-symbols
-               do-symbols
-               dotimes
-               dolist
-               do*
-               do
-               loop
-               return-from
-               return
-               block
-               etypecase
-               typecase
-               ecase
-               case
-               load-time-value
-               eval-when
-               destructuring-bind
-               gentemp
-               gensym
-               pairlis
-               acons
-               subst
-               ;; adjoin ;It's already defined.
-               copy-list
-               ldiff
-               list*
-               cddddr
-               cdddar
-               cddadr
-               cddaar
-               cdaddr
-               cdadar
-               cdaadr
-               cdaaar
-               cadddr
-               caddar
-               cadadr
-               cadaar
-               caaddr
-               caadar
-               caaadr
-               caaaar
-               cdddr
-               cddar
-               cdadr
-               cdaar
-               caddr
-               cadar
-               caadr
-               caaar
-               tenth
-               ninth
-               eighth
-               seventh
-               sixth
-               fifth
-               fourth
-               third
-               endp
-               rest
-               second
-               first
-               svref
-               copy-seq
-               evenp
-               oddp
-               minusp
-               plusp
-               floatp-safe
-               declaim
-               proclaim
-               nth-value
-               multiple-value-call
-               multiple-value-apply
-               multiple-value-list
-               values-list
-               values
-               pushnew
-               decf
-               incf
-
-               dolist
-               dotimes
-               ))
-  (let ((new (if (consp fun) (prog1 (cdr fun) (setq fun (car fun)))
-               (intern (format "cl-%s" fun)))))
-    (if (fboundp new)
-        (unless (or (eq (symbol-function new) fun)
-                    (eq new (and (symbolp fun) (fboundp fun)
-                                 (symbol-function fun))))
-          (message "%S already defined, not rebinding" new))
-      (defalias new fun))))
-
-(unless (symbolp (symbol-function 'position))
-  (autoload 'cl-position "cl-seq")
-  (defadvice cl-position (around cl-lib (cl-item cl-seq &rest cl-keys) 
activate)
-  (let ((argk (ad-get-args 2)))
-    (if (or (null argk) (keywordp (car argk)))
-        ;; This is a call to cl-lib's `cl-position'.
-        (setq ad-return-value
-              (apply #'position (ad-get-arg 0) (ad-get-arg 1) argk))
-      ;; Must be a call to cl's old `cl-position'.
-      ad-do-it))))
-
-(unless (symbolp (symbol-function 'delete-duplicates))
-  (autoload 'cl-delete-duplicates "cl-seq")
-  (defadvice cl-delete-duplicates (around cl-lib (cl-seq &rest cl-keys) 
activate)
-  (let ((argk (ad-get-args 1)))
-    (if (or (null argk) (keywordp (car argk)))
-        ;; This is a call to cl-lib's `cl-delete-duplicates'.
-        (setq ad-return-value
-              (apply #'delete-duplicates (ad-get-arg 0) argk))
-      ;; Must be a call to cl's old `cl-delete-duplicates'.
-      ad-do-it))))
-
-(when (or (not (fboundp 'cl-member))
-          (eq (symbol-function 'cl-member) #'memq))
-  (defalias 'cl-member #'member*))
-
-;; `cl-labels' is not 100% compatible with `labels' when using dynamic scoping
-;; (mostly because it does not turn lambdas that refer to those functions into
-;; closures).  OTOH it is compatible when using lexical scoping.
-
-(unless (fboundp 'cl-labels)
-  (defmacro cl-labels (&rest args)
-    (unless (and (boundp 'lexical-binding) lexical-binding)
-      ;; We used to signal an error rather than a message, but in many uses of
-      ;; cl-labels, the value of lexical-binding doesn't actually matter.
-      ;; More importantly, the value of `lexical-binding' here is unreliable
-      ;; (it does not necessarily reflect faithfully whether the output of this
-      ;; macro will be interpreted as lexically bound code or not).
-      (message "This `cl-labels' requires `lexical-binding' to be non-nil"))
-    `(labels ,@args)))
-
-;;;; ChangeLog:
-
-;; 2014-02-25  Stefan Monnier  <monnier@iro.umontreal.ca>
-;; 
-;;     Fixes: debbugs:16671
-;; 
-;;     * cl-lib.el (cl-position, cl-delete-duplicate): Don't advise if >=24.3.
-;;     (load-path): Try to make sure we're at the end.
-;; 
-;; 2014-01-25  Stefan Monnier  <monnier@iro.umontreal.ca>
-;; 
-;;     * cl-lib.el: Resolve conflicts with old internal definitions
-;;     (bug#16353).
-;;     (dolist fun): Don't skip definitions silently.
-;;     (define-setf-expander): Remove, not in cl-lib.
-;;     (cl-position, cl-delete-duplicates): Add advice to distinguish the use
-;;     case.
-;;     (cl-member): Override old definition.
-;; 
-;; 2013-05-22  Stefan Monnier  <monnier@iro.umontreal.ca>
-;; 
-;;     * cl-lib.el (cl-labels): Demote error to message and improve it.
-;; 
-;; 2012-11-30  Stefan Monnier  <monnier@iro.umontreal.ca>
-;; 
-;;     * cl-lib.el: Try and patch things up in case we're hiding the real
-;;     cl-lib.
-;; 
-;; 2012-11-22  Stefan Monnier  <monnier@iro.umontreal.ca>
-;; 
-;;     Add cl-letf and cl-labels.
-;; 
-;; 2012-11-16  Stefan Monnier  <monnier@iro.umontreal.ca>
-;; 
-;;     * packages/cl-lib: New package.
-;; 
-
-
-(provide 'cl-lib)
-;;; cl-lib.el ends here
diff --git a/lib/ert.el b/lib/ert.el
deleted file mode 100644
index 53b76f77f5..0000000000
--- a/lib/ert.el
+++ /dev/null
@@ -1,2544 +0,0 @@
-;;; ert.el --- Emacs Lisp Regression Testing
-
-;; Copyright (C) 2007, 2008, 2010 Free Software Foundation, Inc.
-
-;; Author: Christian M. Ohler
-;; Keywords: lisp, tools
-
-;; This file is NOT part of GNU Emacs.
-
-;; This program is free software: you can redistribute it and/or
-;; modify it under the terms of the GNU General Public License as
-;; published by the Free Software Foundation, either version 3 of the
-;; License, or (at your option) any later version.
-;;
-;; This program is distributed in the hope that it will be useful, but
-;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-;; General Public License for more details.
-;;
-;; You should have received a copy of the GNU General Public License
-;; along with this program.  If not, see `http://www.gnu.org/licenses/'.
-
-;;; Commentary:
-
-;; ERT is a tool for automated testing in Emacs Lisp.  Its main
-;; features are facilities for defining and running test cases and
-;; reporting the results as well as for debugging test failures
-;; interactively.
-;;
-;; The main entry points are `ert-deftest', which is similar to
-;; `defun' but defines a test, and `ert-run-tests-interactively',
-;; which runs tests and offers an interactive interface for inspecting
-;; results and debugging.  There is also
-;; `ert-run-tests-batch-and-exit' for non-interactive use.
-;;
-;; The body of `ert-deftest' forms resembles a function body, but the
-;; additional operators `should', `should-not' and `should-error' are
-;; available.  `should' is similar to cl's `assert', but signals a
-;; different error when its condition is violated that is caught and
-;; processed by ERT.  In addition, it analyzes its argument form and
-;; records information that helps debugging (`assert' tries to do
-;; something similar when its second argument SHOW-ARGS is true, but
-;; `should' is more sophisticated).  For information on `should-not'
-;; and `should-error', see their docstrings.
-;;
-;; See ERT's info manual as well as the docstrings for more details.
-;; To compile the manual, run `makeinfo ert.texinfo' in the ERT
-;; directory, then C-u M-x info ert.info in Emacs to view it.
-;;
-;; To see some examples of tests written in ERT, see its self-tests in
-;; ert-tests.el.  Some of these are tricky due to the bootstrapping
-;; problem of writing tests for a testing tool, others test simple
-;; functions and are straightforward.
-
-;;; Code:
-
-(eval-when-compile
-  (require 'cl))
-(require 'button)
-(require 'debug)
-(require 'easymenu)
-(require 'ewoc)
-(require 'find-func)
-(require 'help)
-
-
-;;; UI customization options.
-
-(defgroup ert ()
-  "ERT, the Emacs Lisp regression testing tool."
-  :prefix "ert-"
-  :group 'lisp)
-
-(defface ert-test-result-expected '((((class color) (background light))
-                                     :background "green1")
-                                    (((class color) (background dark))
-                                     :background "green3"))
-  "Face used for expected results in the ERT results buffer."
-  :group 'ert)
-
-(defface ert-test-result-unexpected '((((class color) (background light))
-                                       :background "red1")
-                                      (((class color) (background dark))
-                                       :background "red3"))
-  "Face used for unexpected results in the ERT results buffer."
-  :group 'ert)
-
-
-;;; Copies/reimplementations of cl functions.
-
-(defun ert--cl-do-remf (plist tag)
-  "Copy of `cl-do-remf'.  Modify PLIST by removing TAG."
-  (let ((p (cdr plist)))
-    (while (and (cdr p) (not (eq (car (cdr p)) tag))) (setq p (cdr (cdr p))))
-    (and (cdr p) (progn (setcdr p (cdr (cdr (cdr p)))) t))))
-
-(defun ert--remprop (sym tag)
-  "Copy of `cl-remprop'.  Modify SYM's plist by removing TAG."
-  (let ((plist (symbol-plist sym)))
-    (if (and plist (eq tag (car plist)))
-       (progn (setplist sym (cdr (cdr plist))) t)
-      (ert--cl-do-remf plist tag))))
-
-(defun ert--remove-if-not (ert-pred ert-list)
-  "A reimplementation of `remove-if-not'.
-
-ERT-PRED is a predicate, ERT-LIST is the input list."
-  (loop for ert-x in ert-list
-        if (funcall ert-pred ert-x)
-        collect ert-x))
-
-(defun ert--intersection (a b)
-  "A reimplementation of `intersection'.  Intersect the sets A and B.
-
-Elements are compared using `eql'."
-  (loop for x in a
-        if (memql x b)
-        collect x))
-
-(defun ert--set-difference (a b)
-  "A reimplementation of `set-difference'.  Subtract the set B from the set A.
-
-Elements are compared using `eql'."
-  (loop for x in a
-        unless (memql x b)
-        collect x))
-
-(defun ert--set-difference-eq (a b)
-  "A reimplementation of `set-difference'.  Subtract the set B from the set A.
-
-Elements are compared using `eq'."
-  (loop for x in a
-        unless (memq x b)
-        collect x))
-
-(defun ert--union (a b)
-  "A reimplementation of `union'.  Compute the union of the sets A and B.
-
-Elements are compared using `eql'."
-  (append a (ert--set-difference b a)))
-
-(eval-and-compile
-  (defvar ert--gensym-counter 0))
-
-(eval-and-compile
-  (defun ert--gensym (&optional prefix)
-    "Only allows string PREFIX, not compatible with CL."
-    (unless prefix (setq prefix "G"))
-    (make-symbol (format "%s%s"
-                         prefix
-                         (prog1 ert--gensym-counter
-                           (incf ert--gensym-counter))))))
-
-(defun ert--coerce-to-vector (x)
-  "Coerce X to a vector."
-  (when (char-table-p x) (error "Not supported"))
-  (if (vectorp x)
-      x
-    (vconcat x)))
-
-(defun* ert--remove* (x list &key key test)
-  "Does not support all the keywords of remove*."
-  (unless key (setq key #'identity))
-  (unless test (setq test #'eql))
-  (loop for y in list
-        unless (funcall test x (funcall key y))
-        collect y))
-
-(defun ert--string-position (c s)
-  "Return the position of the first occurrence of C in S, or nil if none."
-  (loop for i from 0
-        for x across s
-        when (eql x c) return i))
-
-(defun ert--mismatch (a b)
-  "Return index of first element that differs between A and B.
-
-Like `mismatch'.  Uses `equal' for comparison."
-  (cond ((or (listp a) (listp b))
-         (ert--mismatch (ert--coerce-to-vector a)
-                        (ert--coerce-to-vector b)))
-        ((> (length a) (length b))
-         (ert--mismatch b a))
-        (t
-         (let ((la (length a))
-               (lb (length b)))
-           (assert (arrayp a) t)
-           (assert (arrayp b) t)
-           (assert (<= la lb) t)
-           (loop for i below la
-                 when (not (equal (aref a i) (aref b i))) return i
-                 finally (return (if (/= la lb)
-                                     la
-                                   (assert (equal a b) t)
-                                   nil)))))))
-
-(defun ert--subseq (seq start &optional end)
-  "Return a subsequence of SEQ from START to END."
-  (when (char-table-p seq) (error "Not supported"))
-  (let ((vector (substring (ert--coerce-to-vector seq) start end)))
-    (etypecase seq
-      (vector vector)
-      (string (concat vector))
-      (list (append vector nil))
-      (bool-vector (loop with result = (make-bool-vector (length vector) nil)
-                         for i below (length vector) do
-                         (setf (aref result i) (aref vector i))
-                         finally (return result)))
-      (char-table (assert nil)))))
-
-(defun ert-equal-including-properties (a b)
-  "Return t if A and B have similar structure and contents.
-
-This is like `equal-including-properties' except that it compares
-the property values of text properties structurally (by
-recursing) rather than with `eq'.  Perhaps this is what
-`equal-including-properties' should do in the first place; see
-Emacs bug 6581 at URL `http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6581'."
-  ;; This implementation is inefficient.  Rather than making it
-  ;; efficient, let's hope bug 6581 gets fixed so that we can delete
-  ;; it altogether.
-  (not (ert--explain-not-equal-including-properties a b)))
-
-
-;;; Defining and locating tests.
-
-;; The data structure that represents a test case.
-(defstruct ert-test
-  (name nil)
-  (documentation nil)
-  (body (assert nil))
-  (most-recent-result nil)
-  (expected-result-type ':passed)
-  (tags '()))
-
-(defun ert-test-boundp (symbol)
-  "Return non-nil if SYMBOL names a test."
-  (and (get symbol 'ert--test) t))
-
-(defun ert-get-test (symbol)
-  "If SYMBOL names a test, return that.  Signal an error otherwise."
-  (unless (ert-test-boundp symbol) (error "No test named `%S'" symbol))
-  (get symbol 'ert--test))
-
-(defun ert-set-test (symbol definition)
-  "Make SYMBOL name the test DEFINITION, and return DEFINITION."
-  (when (eq symbol 'nil)
-    ;; We disallow nil since `ert-test-at-point' and related functions
-    ;; want to return a test name, but also need an out-of-band value
-    ;; on failure.  Nil is the most natural out-of-band value; using 0
-    ;; or "" or signalling an error would be too awkward.
-    ;;
-    ;; Note that nil is still a valid value for the `name' slot in
-    ;; ert-test objects.  It designates an anonymous test.
-    (error "Attempt to define a test named nil"))
-  (put symbol 'ert--test definition)
-  definition)
-
-(defun ert-make-test-unbound (symbol)
-  "Make SYMBOL name no test.  Return SYMBOL."
-  (ert--remprop symbol 'ert--test)
-  symbol)
-
-(defun ert--parse-keys-and-body (keys-and-body)
-  "Split KEYS-AND-BODY into keyword-and-value pairs and the remaining body.
-
-KEYS-AND-BODY should have the form of a property list, with the
-exception that only keywords are permitted as keys and that the
-tail -- the body -- is a list of forms that does not start with a
-keyword.
-
-Returns a two-element list containing the keys-and-values plist
-and the body."
-  (let ((extracted-key-accu '())
-        (remaining keys-and-body))
-    (while (and (consp remaining) (keywordp (first remaining)))
-      (let ((keyword (pop remaining)))
-        (unless (consp remaining)
-          (error "Value expected after keyword %S in %S"
-                 keyword keys-and-body))
-        (when (assoc keyword extracted-key-accu)
-          (warn "Keyword %S appears more than once in %S" keyword
-                keys-and-body))
-        (push (cons keyword (pop remaining)) extracted-key-accu)))
-    (setq extracted-key-accu (nreverse extracted-key-accu))
-    (list (loop for (key . value) in extracted-key-accu
-                collect key
-                collect value)
-          remaining)))
-
-;;;###autoload
-(defmacro* ert-deftest (name () &body docstring-keys-and-body)
-  "Define NAME (a symbol) as a test.
-
-BODY is evaluated as a `progn' when the test is run.  It should
-signal a condition on failure or just return if the test passes.
-
-`should', `should-not' and `should-error' are useful for
-assertions in BODY.
-
-Use `ert' to run tests interactively.
-
-Tests that are expected to fail can be marked as such
-using :expected-result.  See `ert-test-result-type-p' for a
-description of valid values for RESULT-TYPE.
-
-\(fn NAME () [DOCSTRING] [:expected-result RESULT-TYPE] \
-\[:tags '(TAG...)] BODY...)"
-  (declare (debug (&define :name test
-                           name sexp [&optional stringp]
-                          [&rest keywordp sexp] def-body))
-           (doc-string 3)
-           (indent 2))
-  (let ((documentation nil)
-        (documentation-supplied-p nil))
-    (when (stringp (first docstring-keys-and-body))
-      (setq documentation (pop docstring-keys-and-body)
-            documentation-supplied-p t))
-    (destructuring-bind ((&key (expected-result nil expected-result-supplied-p)
-                               (tags nil tags-supplied-p))
-                         body)
-        (ert--parse-keys-and-body docstring-keys-and-body)
-      `(progn
-         (ert-set-test ',name
-                       (make-ert-test
-                        :name ',name
-                        ,@(when documentation-supplied-p
-                            `(:documentation ,documentation))
-                        ,@(when expected-result-supplied-p
-                            `(:expected-result-type ,expected-result))
-                        ,@(when tags-supplied-p
-                            `(:tags ,tags))
-                        :body (lambda () ,@body)))
-         ;; This hack allows `symbol-file' to associate `ert-deftest'
-         ;; forms with files, and therefore enables `find-function' to
-         ;; work with tests.  However, it leads to warnings in
-         ;; `unload-feature', which doesn't know how to undefine tests
-         ;; and has no mechanism for extension.
-         (push '(ert-deftest . ,name) current-load-list)
-         ',name))))
-
-;; We use these `put' forms in addition to the (declare (indent)) in
-;; the defmacro form since the `declare' alone does not lead to
-;; correct indentation before the .el/.elc file is loaded.
-;; Autoloading these `put' forms solves this.
-;;;###autoload
-(progn
-  ;; TODO(ohler): Figure out what these mean and make sure they are correct.
-  (put 'ert-deftest 'lisp-indent-function 2)
-  (put 'ert-info 'lisp-indent-function 1))
-
-(defvar ert--find-test-regexp
-  (concat "^\\s-*(ert-deftest"
-          find-function-space-re
-          "%s\\(\\s-\\|$\\)")
-  "The regexp the `find-function' mechanisms use for finding test 
definitions.")
-
-
-(put 'ert-test-failed 'error-conditions '(error ert-test-failed))
-(put 'ert-test-failed 'error-message "Test failed")
-
-(defun ert-pass ()
-  "Terminate the current test and mark it passed.  Does not return."
-  (throw 'ert--pass nil))
-
-(defun ert-fail (data)
-  "Terminate the current test and mark it failed.  Does not return.
-DATA is displayed to the user and should state the reason of the failure."
-  (signal 'ert-test-failed (list data)))
-
-
-;;; The `should' macros.
-
-(defvar ert--should-execution-observer nil)
-
-(defun ert--signal-should-execution (form-description)
-  "Tell the current `should' form observer (if any) about FORM-DESCRIPTION."
-  (when ert--should-execution-observer
-    (funcall ert--should-execution-observer form-description)))
-
-(defun ert--special-operator-p (thing)
-  "Return non-nil if THING is a symbol naming a special operator."
-  (and (symbolp thing)
-       (let ((definition (indirect-function thing t)))
-         (and (subrp definition)
-              (eql (cdr (subr-arity definition)) 'unevalled)))))
-
-(defun ert--expand-should-1 (whole form inner-expander)
-  "Helper function for the `should' macro and its variants."
-  (let ((form
-         ;; If `cl-macroexpand' isn't bound, the code that we're
-         ;; compiling doesn't depend on cl and thus doesn't need an
-         ;; environment arg for `macroexpand'.
-         (if (fboundp 'cl-macroexpand)
-             ;; Suppress warning about run-time call to cl funtion: we
-             ;; only call it if it's fboundp.
-             (with-no-warnings
-               (cl-macroexpand form (and (boundp 'cl-macro-environment)
-                                         cl-macro-environment)))
-           (macroexpand form))))
-    (cond
-     ((or (atom form) (ert--special-operator-p (car form)))
-      (let ((value (ert--gensym "value-")))
-        `(let ((,value (ert--gensym "ert-form-evaluation-aborted-")))
-           ,(funcall inner-expander
-                     `(setq ,value ,form)
-                     `(list ',whole :form ',form :value ,value)
-                     value)
-           ,value)))
-     (t
-      (let ((fn-name (car form))
-            (arg-forms (cdr form)))
-        (assert (or (symbolp fn-name)
-                    (and (consp fn-name)
-                         (eql (car fn-name) 'lambda)
-                         (listp (cdr fn-name)))))
-        (let ((fn (ert--gensym "fn-"))
-              (args (ert--gensym "args-"))
-              (value (ert--gensym "value-"))
-              (default-value (ert--gensym "ert-form-evaluation-aborted-")))
-          `(let ((,fn (function ,fn-name))
-                 (,args (list ,@arg-forms)))
-             (let ((,value ',default-value))
-               ,(funcall inner-expander
-                         `(setq ,value (apply ,fn ,args))
-                         `(nconc (list ',whole)
-                                 (list :form `(,,fn ,@,args))
-                                 (unless (eql ,value ',default-value)
-                                   (list :value ,value))
-                                 (let ((-explainer-
-                                        (and (symbolp ',fn-name)
-                                             (get ',fn-name 'ert-explainer))))
-                                   (when -explainer-
-                                     (list :explanation
-                                           (apply -explainer- ,args)))))
-                         value)
-               ,value))))))))
-
-(defun ert--expand-should (whole form inner-expander)
-  "Helper function for the `should' macro and its variants.
-
-Analyzes FORM and returns an expression that has the same
-semantics under evaluation but records additional debugging
-information.
-
-INNER-EXPANDER should be a function and is called with two
-arguments: INNER-FORM and FORM-DESCRIPTION-FORM, where INNER-FORM
-is an expression equivalent to FORM, and FORM-DESCRIPTION-FORM is
-an expression that returns a description of FORM.  INNER-EXPANDER
-should return code that calls INNER-FORM and performs the checks
-and error signalling specific to the particular variant of
-`should'.  The code that INNER-EXPANDER returns must not call
-FORM-DESCRIPTION-FORM before it has called INNER-FORM."
-  (lexical-let ((inner-expander inner-expander))
-    (ert--expand-should-1
-     whole form
-     (lambda (inner-form form-description-form value-var)
-       (let ((form-description (ert--gensym "form-description-")))
-         `(let (,form-description)
-            ,(funcall inner-expander
-                      `(unwind-protect
-                           ,inner-form
-                         (setq ,form-description ,form-description-form)
-                         (ert--signal-should-execution ,form-description))
-                      `,form-description
-                      value-var)))))))
-
-(defmacro* should (form)
-  "Evaluate FORM.  If it returns nil, abort the current test as failed.
-
-Returns the value of FORM."
-  (ert--expand-should `(should ,form) form
-                      (lambda (inner-form form-description-form value-var)
-                        `(unless ,inner-form
-                           (ert-fail ,form-description-form)))))
-
-(defmacro* should-not (form)
-  "Evaluate FORM.  If it returns non-nil, abort the current test as failed.
-
-Returns nil."
-  (ert--expand-should `(should-not ,form) form
-                      (lambda (inner-form form-description-form value-var)
-                        `(unless (not ,inner-form)
-                           (ert-fail ,form-description-form)))))
-
-(defun ert--should-error-handle-error (form-description-fn
-                                       condition type exclude-subtypes)
-  "Helper function for `should-error'.
-
-Determines whether CONDITION matches TYPE and EXCLUDE-SUBTYPES,
-and aborts the current test as failed if it doesn't."
-  (let ((signalled-conditions (get (car condition) 'error-conditions))
-        (handled-conditions (etypecase type
-                              (list type)
-                              (symbol (list type)))))
-    (assert signalled-conditions)
-    (unless (ert--intersection signalled-conditions handled-conditions)
-      (ert-fail (append
-                 (funcall form-description-fn)
-                 (list
-                  :condition condition
-                  :fail-reason (concat "the error signalled did not"
-                                       " have the expected type")))))
-    (when exclude-subtypes
-      (unless (member (car condition) handled-conditions)
-        (ert-fail (append
-                   (funcall form-description-fn)
-                   (list
-                    :condition condition
-                    :fail-reason (concat "the error signalled was a subtype"
-                                         " of the expected type"))))))))
-
-;; FIXME: The expansion will evaluate the keyword args (if any) in
-;; nonstandard order.
-(defmacro* should-error (form &rest keys &key type exclude-subtypes)
-  "Evaluate FORM and check that it signals an error.
-
-The error signalled needs to match TYPE.  TYPE should be a list
-of condition names.  (It can also be a non-nil symbol, which is
-equivalent to a singleton list containing that symbol.)  If
-EXCLUDE-SUBTYPES is nil, the error matches TYPE if one of its
-condition names is an element of TYPE.  If EXCLUDE-SUBTYPES is
-non-nil, the error matches TYPE if it is an element of TYPE.
-
-If the error matches, returns (ERROR-SYMBOL . DATA) from the
-error.  If not, or if no error was signalled, abort the test as
-failed."
-  (unless type (setq type ''error))
-  (ert--expand-should
-   `(should-error ,form ,@keys)
-   form
-   (lambda (inner-form form-description-form value-var)
-     (let ((errorp (ert--gensym "errorp"))
-           (form-description-fn (ert--gensym "form-description-fn-")))
-       `(let ((,errorp nil)
-              (,form-description-fn (lambda () ,form-description-form)))
-          (condition-case -condition-
-              ,inner-form
-            ;; We can't use ,type here because we want to evaluate it.
-            (error
-             (setq ,errorp t)
-             (ert--should-error-handle-error ,form-description-fn
-                                             -condition-
-                                             ,type ,exclude-subtypes)
-             (setq ,value-var -condition-)))
-          (unless ,errorp
-            (ert-fail (append
-                       (funcall ,form-description-fn)
-                       (list
-                        :fail-reason "did not signal an error")))))))))
-
-
-;;; Explanation of `should' failures.
-
-;; TODO(ohler): Rework explanations so that they are displayed in a
-;; similar way to `ert-info' messages; in particular, allow text
-;; buttons in explanations that give more detail or open an ediff
-;; buffer.  Perhaps explanations should be reported through `ert-info'
-;; rather than as part of the condition.
-
-(defun ert--proper-list-p (x)
-  "Return non-nil if X is a proper list, nil otherwise."
-  (loop
-   for firstp = t then nil
-   for fast = x then (cddr fast)
-   for slow = x then (cdr slow) do
-   (when (null fast) (return t))
-   (when (not (consp fast)) (return nil))
-   (when (null (cdr fast)) (return t))
-   (when (not (consp (cdr fast))) (return nil))
-   (when (and (not firstp) (eq fast slow)) (return nil))))
-
-(defun ert--explain-format-atom (x)
-  "Format the atom X for `ert--explain-not-equal'."
-  (typecase x
-    (fixnum (list x (format "#x%x" x) (format "?%c" x)))
-    (t x)))
-
-(defun ert--explain-not-equal (a b)
-  "Explainer function for `equal'.
-
-Returns a programmer-readable explanation of why A and B are not
-`equal', or nil if they are."
-  (if (not (equal (type-of a) (type-of b)))
-      `(different-types ,a ,b)
-    (etypecase a
-      (cons
-       (let ((a-proper-p (ert--proper-list-p a))
-             (b-proper-p (ert--proper-list-p b)))
-         (if (not (eql (not a-proper-p) (not b-proper-p)))
-             `(one-list-proper-one-improper ,a ,b)
-           (if a-proper-p
-               (if (not (equal (length a) (length b)))
-                   `(proper-lists-of-different-length ,(length a) ,(length b)
-                                                      ,a ,b
-                                                      first-mismatch-at
-                                                      ,(ert--mismatch a b))
-                 (loop for i from 0
-                       for ai in a
-                       for bi in b
-                       for xi = (ert--explain-not-equal ai bi)
-                       do (when xi (return `(list-elt ,i ,xi)))
-                       finally (assert (equal a b) t)))
-             (let ((car-x (ert--explain-not-equal (car a) (car b))))
-               (if car-x
-                   `(car ,car-x)
-                 (let ((cdr-x (ert--explain-not-equal (cdr a) (cdr b))))
-                   (if cdr-x
-                       `(cdr ,cdr-x)
-                     (assert (equal a b) t)
-                     nil))))))))
-      (array (if (not (equal (length a) (length b)))
-                 `(arrays-of-different-length ,(length a) ,(length b)
-                                              ,a ,b
-                                              ,@(unless (char-table-p a)
-                                                  `(first-mismatch-at
-                                                    ,(ert--mismatch a b))))
-               (loop for i from 0
-                     for ai across a
-                     for bi across b
-                     for xi = (ert--explain-not-equal ai bi)
-                     do (when xi (return `(array-elt ,i ,xi)))
-                     finally (assert (equal a b) t))))
-      (atom (if (not (equal a b))
-                (if (and (symbolp a) (symbolp b) (string= a b))
-                    `(different-symbols-with-the-same-name ,a ,b)
-                  `(different-atoms ,(ert--explain-format-atom a)
-                                    ,(ert--explain-format-atom b)))
-              nil)))))
-(put 'equal 'ert-explainer 'ert--explain-not-equal)
-
-(defun ert--significant-plist-keys (plist)
-  "Return the keys of PLIST that have non-null values, in order."
-  (assert (zerop (mod (length plist) 2)) t)
-  (loop for (key value . rest) on plist by #'cddr
-        unless (or (null value) (memq key accu)) collect key into accu
-        finally (return accu)))
-
-(defun ert--plist-difference-explanation (a b)
-  "Return a programmer-readable explanation of why A and B are different 
plists.
-
-Returns nil if they are equivalent, i.e., have the same value for
-each key, where absent values are treated as nil.  The order of
-key/value pairs in each list does not matter."
-  (assert (zerop (mod (length a) 2)) t)
-  (assert (zerop (mod (length b) 2)) t)
-  ;; Normalizing the plists would be another way to do this but it
-  ;; requires a total ordering on all lisp objects (since any object
-  ;; is valid as a text property key).  Perhaps defining such an
-  ;; ordering is useful in other contexts, too, but it's a lot of
-  ;; work, so let's punt on it for now.
-  (let* ((keys-a (ert--significant-plist-keys a))
-         (keys-b (ert--significant-plist-keys b))
-         (keys-in-a-not-in-b (ert--set-difference-eq keys-a keys-b))
-         (keys-in-b-not-in-a (ert--set-difference-eq keys-b keys-a)))
-    (flet ((explain-with-key (key)
-             (let ((value-a (plist-get a key))
-                   (value-b (plist-get b key)))
-               (assert (not (equal value-a value-b)) t)
-               `(different-properties-for-key
-                 ,key ,(ert--explain-not-equal-including-properties value-a
-                                                                    
value-b)))))
-      (cond (keys-in-a-not-in-b
-             (explain-with-key (first keys-in-a-not-in-b)))
-            (keys-in-b-not-in-a
-             (explain-with-key (first keys-in-b-not-in-a)))
-            (t
-             (loop for key in keys-a
-                   when (not (equal (plist-get a key) (plist-get b key)))
-                   return (explain-with-key key)))))))
-
-(defun ert--abbreviate-string (s len suffixp)
-  "Shorten string S to at most LEN chars.
-
-If SUFFIXP is non-nil, returns a suffix of S, otherwise a prefix."
-  (let ((n (length s)))
-    (cond ((< n len)
-           s)
-          (suffixp
-           (substring s (- n len)))
-          (t
-           (substring s 0 len)))))
-
-(defun ert--explain-not-equal-including-properties (a b)
-  "Explainer function for `ert-equal-including-properties'.
-
-Returns a programmer-readable explanation of why A and B are not
-`ert-equal-including-properties', or nil if they are."
-  (if (not (equal a b))
-      (ert--explain-not-equal a b)
-    (assert (stringp a) t)
-    (assert (stringp b) t)
-    (assert (eql (length a) (length b)) t)
-    (loop for i from 0 to (length a)
-          for props-a = (text-properties-at i a)
-          for props-b = (text-properties-at i b)
-          for difference = (ert--plist-difference-explanation props-a props-b)
-          do (when difference
-               (return `(char ,i ,(substring-no-properties a i (1+ i))
-                              ,difference
-                              context-before
-                              ,(ert--abbreviate-string
-                                (substring-no-properties a 0 i)
-                                10 t)
-                              context-after
-                              ,(ert--abbreviate-string
-                                (substring-no-properties a (1+ i))
-                                10 nil))))
-          ;; TODO(ohler): Get `equal-including-properties' fixed in
-          ;; Emacs, delete `ert-equal-including-properties', and
-          ;; re-enable this assertion.
-          ;;finally (assert (equal-including-properties a b) t)
-          )))
-(put 'ert-equal-including-properties
-     'ert-explainer
-     'ert--explain-not-equal-including-properties)
-
-
-;;; Implementation of `ert-info'.
-
-;; TODO(ohler): The name `info' clashes with
-;; `ert--test-execution-info'.  One or both should be renamed.
-(defvar ert--infos '()
-  "The stack of `ert-info' infos that currently apply.
-
-Bound dynamically.  This is a list of (PREFIX . MESSAGE) pairs.")
-
-(defmacro* ert-info ((message-form &key ((:prefix prefix-form) "Info: "))
-                     &body body)
-  "Evaluate MESSAGE-FORM and BODY, and report the message if BODY fails.
-
-To be used within ERT tests.  MESSAGE-FORM should evaluate to a
-string that will be displayed together with the test result if
-the test fails.  PREFIX-FORM should evaluate to a string as well
-and is displayed in front of the value of MESSAGE-FORM."
-  (declare (debug ((form &rest [sexp form]) body))
-          (indent 1))
-  `(let ((ert--infos (cons (cons ,prefix-form ,message-form) ert--infos)))
-     ,@body))
-
-
-
-;;; Facilities for running a single test.
-
-(defvar ert-debug-on-error nil
-  "Non-nil means enter debugger when a test fails or terminates with an 
error.")
-
-;; The data structures that represent the result of running a test.
-(defstruct ert-test-result
-  (messages nil)
-  (should-forms nil)
-  )
-(defstruct (ert-test-passed (:include ert-test-result)))
-(defstruct (ert-test-result-with-condition (:include ert-test-result))
-  (condition (assert nil))
-  (backtrace (assert nil))
-  (infos (assert nil)))
-(defstruct (ert-test-quit (:include ert-test-result-with-condition)))
-(defstruct (ert-test-failed (:include ert-test-result-with-condition)))
-(defstruct (ert-test-aborted-with-non-local-exit (:include ert-test-result)))
-
-
-(defun ert--record-backtrace ()
-  "Record the current backtrace (as a list) and return it."
-  ;; Since the backtrace is stored in the result object, result
-  ;; objects must only be printed with appropriate limits
-  ;; (`print-level' and `print-length') in place.  For interactive
-  ;; use, the cost of ensuring this possibly outweighs the advantage
-  ;; of storing the backtrace for
-  ;; `ert-results-pop-to-backtrace-for-test-at-point' given that we
-  ;; already have `ert-results-rerun-test-debugging-errors-at-point'.
-  ;; For batch use, however, printing the backtrace may be useful.
-  (loop
-   ;; 6 is the number of frames our own debugger adds (when
-   ;; compiled; more when interpreted).  FIXME: Need to describe a
-   ;; procedure for determining this constant.
-   for i from 6
-   for frame = (backtrace-frame i)
-   while frame
-   collect frame))
-
-(defun ert--print-backtrace (backtrace)
-  "Format the backtrace BACKTRACE to the current buffer."
-  ;; This is essentially a reimplementation of Fbacktrace
-  ;; (src/eval.c), but for a saved backtrace, not the current one.
-  (let ((print-escape-newlines t)
-        (print-level 8)
-        (print-length 50))
-    (dolist (frame backtrace)
-      (ecase (first frame)
-        ((nil)
-         ;; Special operator.
-         (destructuring-bind (special-operator &rest arg-forms)
-             (cdr frame)
-           (insert
-            (format "  %S\n" (list* special-operator arg-forms)))))
-        ((t)
-         ;; Function call.
-         (destructuring-bind (fn &rest args) (cdr frame)
-           (insert (format "  %S(" fn))
-           (loop for firstp = t then nil
-                 for arg in args do
-                 (unless firstp
-                   (insert " "))
-                 (insert (format "%S" arg)))
-           (insert ")\n")))))))
-
-;; A container for the state of the execution of a single test and
-;; environment data needed during its execution.
-(defstruct ert--test-execution-info
-  (test (assert nil))
-  (result (assert nil))
-  ;; A thunk that may be called when RESULT has been set to its final
-  ;; value and test execution should be terminated.  Should not
-  ;; return.
-  (exit-continuation (assert nil))
-  ;; The binding of `debugger' outside of the execution of the test.
-  next-debugger
-  ;; The binding of `ert-debug-on-error' that is in effect for the
-  ;; execution of the current test.  We store it to avoid being
-  ;; affected by any new bindings the test itself may establish.  (I
-  ;; don't remember whether this feature is important.)
-  ert-debug-on-error)
-
-(defun ert--run-test-debugger (info debugger-args)
-  "During a test run, `debugger' is bound to a closure that calls this 
function.
-
-This function records failures and errors and either terminates
-the test silently or calls the interactive debugger, as
-appropriate.
-
-INFO is the ert--test-execution-info corresponding to this test
-run.  DEBUGGER-ARGS are the arguments to `debugger'."
-  (destructuring-bind (first-debugger-arg &rest more-debugger-args)
-      debugger-args
-    (ecase first-debugger-arg
-      ((lambda debug t exit nil)
-       (apply (ert--test-execution-info-next-debugger info) debugger-args))
-      (error
-       (let* ((condition (first more-debugger-args))
-              (type (case (car condition)
-                      ((quit) 'quit)
-                      (otherwise 'failed)))
-              (backtrace (ert--record-backtrace))
-              (infos (reverse ert--infos)))
-         (setf (ert--test-execution-info-result info)
-               (ecase type
-                 (quit
-                  (make-ert-test-quit :condition condition
-                                      :backtrace backtrace
-                                      :infos infos))
-                 (failed
-                  (make-ert-test-failed :condition condition
-                                        :backtrace backtrace
-                                        :infos infos))))
-         ;; Work around Emacs' heuristic (in eval.c) for detecting
-         ;; errors in the debugger.
-         (incf num-nonmacro-input-events)
-         ;; FIXME: We should probably implement more fine-grained
-         ;; control a la non-t `debug-on-error' here.
-         (cond
-          ((ert--test-execution-info-ert-debug-on-error info)
-           (apply (ert--test-execution-info-next-debugger info) debugger-args))
-          (t))
-         (funcall (ert--test-execution-info-exit-continuation info)))))))
-
-(defun ert--run-test-internal (ert-test-execution-info)
-  "Low-level function to run a test according to ERT-TEST-EXECUTION-INFO.
-
-This mainly sets up debugger-related bindings."
-  (lexical-let ((info ert-test-execution-info))
-    (setf (ert--test-execution-info-next-debugger info) debugger
-          (ert--test-execution-info-ert-debug-on-error info) 
ert-debug-on-error)
-    (catch 'ert--pass
-      ;; For now, each test gets its own temp buffer and its own
-      ;; window excursion, just to be safe.  If this turns out to be
-      ;; too expensive, we can remove it.
-      (with-temp-buffer
-        (save-window-excursion
-          (let ((debugger (lambda (&rest debugger-args)
-                            (ert--run-test-debugger info debugger-args)))
-                (debug-on-error t)
-                (debug-on-quit t)
-                ;; FIXME: Do we need to store the old binding of this
-                ;; and consider it in `ert--run-test-debugger'?
-                (debug-ignored-errors nil)
-                (ert--infos '()))
-            (funcall (ert-test-body (ert--test-execution-info-test info))))))
-      (ert-pass))
-    (setf (ert--test-execution-info-result info) (make-ert-test-passed)))
-  nil)
-
-(defun ert--force-message-log-buffer-truncation ()
-  "Immediately truncate *Messages* buffer according to `message-log-max'.
-
-This can be useful after reducing the value of `message-log-max'."
-  (with-current-buffer (get-buffer-create "*Messages*")
-    ;; This is a reimplementation of this part of message_dolog() in xdisp.c:
-    ;; if (NATNUMP (Vmessage_log_max))
-    ;;   {
-    ;;     scan_newline (Z, Z_BYTE, BEG, BEG_BYTE,
-    ;;                   -XFASTINT (Vmessage_log_max) - 1, 0);
-    ;;     del_range_both (BEG, BEG_BYTE, PT, PT_BYTE, 0);
-    ;;   }
-    (when (and (integerp message-log-max) (>= message-log-max 0))
-      (let ((begin (point-min))
-            (end (save-excursion
-                   (goto-char (point-max))
-                   (forward-line (- message-log-max))
-                   (point))))
-        (delete-region begin end)))))
-
-(defvar ert--running-tests nil
-  "List of tests that are currently in execution.
-
-This list is empty while no test is running, has one element
-while a test is running, two elements while a test run from
-inside a test is running, etc.  The list is in order of nesting,
-innermost test first.
-
-The elements are of type `ert-test'.")
-
-(defun ert-run-test (ert-test)
-  "Run ERT-TEST.
-
-Returns the result and stores it in ERT-TEST's `most-recent-result' slot."
-  (setf (ert-test-most-recent-result ert-test) nil)
-  (block error
-    (lexical-let ((begin-marker
-                   (with-current-buffer (get-buffer-create "*Messages*")
-                     (set-marker (make-marker) (point-max)))))
-      (unwind-protect
-          (lexical-let ((info (make-ert--test-execution-info
-                               :test ert-test
-                               :result
-                               (make-ert-test-aborted-with-non-local-exit)
-                               :exit-continuation (lambda ()
-                                                    (return-from error nil))))
-                        (should-form-accu (list)))
-            (unwind-protect
-                (let ((ert--should-execution-observer
-                       (lambda (form-description)
-                         (push form-description should-form-accu)))
-                      (message-log-max t)
-                      (ert--running-tests (cons ert-test ert--running-tests)))
-                  (ert--run-test-internal info))
-              (let ((result (ert--test-execution-info-result info)))
-                (setf (ert-test-result-messages result)
-                      (with-current-buffer (get-buffer-create "*Messages*")
-                        (buffer-substring begin-marker (point-max))))
-                (ert--force-message-log-buffer-truncation)
-                (setq should-form-accu (nreverse should-form-accu))
-                (setf (ert-test-result-should-forms result)
-                      should-form-accu)
-                (setf (ert-test-most-recent-result ert-test) result))))
-        (set-marker begin-marker nil))))
-  (ert-test-most-recent-result ert-test))
-
-(defun ert-running-test ()
-  "Return the top-level test currently executing."
-  (car (last ert--running-tests)))
-
-
-;;; Test selectors.
-
-(defun ert-test-result-type-p (result result-type)
-  "Return non-nil if RESULT matches type RESULT-TYPE.
-
-Valid result types:
-
-nil -- Never matches.
-t -- Always matches.
-:failed, :passed -- Matches corresponding results.
-\(and TYPES...\) -- Matches if all TYPES match.
-\(or TYPES...\) -- Matches if some TYPES match.
-\(not TYPE\) -- Matches if TYPE does not match.
-\(satisfies PREDICATE\) -- Matches if PREDICATE returns true when called with
-                           RESULT."
-  ;; It would be easy to add `member' and `eql' types etc., but I
-  ;; haven't bothered yet.
-  (etypecase result-type
-    ((member nil) nil)
-    ((member t) t)
-    ((member :failed) (ert-test-failed-p result))
-    ((member :passed) (ert-test-passed-p result))
-    (cons
-     (destructuring-bind (operator &rest operands) result-type
-       (ecase operator
-         (and
-          (case (length operands)
-            (0 t)
-            (t
-             (and (ert-test-result-type-p result (first operands))
-                  (ert-test-result-type-p result `(and ,@(rest operands)))))))
-         (or
-          (case (length operands)
-            (0 nil)
-            (t
-             (or (ert-test-result-type-p result (first operands))
-                 (ert-test-result-type-p result `(or ,@(rest operands)))))))
-         (not
-          (assert (eql (length operands) 1))
-          (not (ert-test-result-type-p result (first operands))))
-         (satisfies
-          (assert (eql (length operands) 1))
-          (funcall (first operands) result)))))))
-
-(defun ert-test-result-expected-p (test result)
-  "Return non-nil if TEST's expected result type matches RESULT."
-  (ert-test-result-type-p result (ert-test-expected-result-type test)))
-
-(defun ert-select-tests (selector universe)
-  "Return the tests that match SELECTOR.
-
-UNIVERSE specifies the set of tests to select from; it should be
-a list of tests, or t, which refers to all tests named by symbols
-in `obarray'.
-
-Returns the set of tests as a list.
-
-Valid selectors:
-
-nil -- Selects the empty set.
-t -- Selects UNIVERSE.
-:new -- Selects all tests that have not been run yet.
-:failed, :passed -- Select tests according to their most recent result.
-:expected, :unexpected -- Select tests according to their most recent result.
-a string -- Selects all tests that have a name that matches the string,
-            a regexp.
-a test -- Selects that test.
-a symbol -- Selects the test that the symbol names, errors if none.
-\(member TESTS...\) -- Selects TESTS, a list of tests or symbols naming tests.
-\(eql TEST\) -- Selects TEST, a test or a symbol naming a test.
-\(and SELECTORS...\) -- Selects the tests that match all SELECTORS.
-\(or SELECTORS...\) -- Selects the tests that match any SELECTOR.
-\(not SELECTOR\) -- Selects all tests that do not match SELECTOR.
-\(tag TAG) -- Selects all tests that have TAG on their tags list.
-\(satisfies PREDICATE\) -- Selects all tests that satisfy PREDICATE.
-
-Only selectors that require a superset of tests, such
-as (satisfies ...), strings, :new, etc. make use of UNIVERSE.
-Selectors that do not, such as \(member ...\), just return the
-set implied by them without checking whether it is really
-contained in UNIVERSE."
-  ;; This code needs to match the etypecase in
-  ;; `ert-insert-human-readable-selector'.
-  (etypecase selector
-    ((member nil) nil)
-    ((member t) (etypecase universe
-                  (list universe)
-                  ((member t) (ert-select-tests "" universe))))
-    ((member :new) (ert-select-tests
-                    `(satisfies ,(lambda (test)
-                                   (null (ert-test-most-recent-result test))))
-                    universe))
-    ((member :failed) (ert-select-tests
-                       `(satisfies ,(lambda (test)
-                                      (ert-test-result-type-p
-                                       (ert-test-most-recent-result test)
-                                       ':failed)))
-                       universe))
-    ((member :passed) (ert-select-tests
-                       `(satisfies ,(lambda (test)
-                                      (ert-test-result-type-p
-                                       (ert-test-most-recent-result test)
-                                       ':passed)))
-                       universe))
-    ((member :expected) (ert-select-tests
-                         `(satisfies
-                           ,(lambda (test)
-                              (ert-test-result-expected-p
-                               test
-                               (ert-test-most-recent-result test))))
-                         universe))
-    ((member :unexpected) (ert-select-tests `(not :expected) universe))
-    (string
-     (etypecase universe
-       ((member t) (mapcar #'ert-get-test
-                           (apropos-internal selector #'ert-test-boundp)))
-       (list (ert--remove-if-not (lambda (test)
-                                   (and (ert-test-name test)
-                                        (string-match selector
-                                                      (ert-test-name test))))
-                                 universe))))
-    (ert-test (list selector))
-    (symbol
-     (assert (ert-test-boundp selector))
-     (list (ert-get-test selector)))
-    (cons
-     (destructuring-bind (operator &rest operands) selector
-       (ecase operator
-         (member
-          (mapcar (lambda (purported-test)
-                    (etypecase purported-test
-                      (symbol (assert (ert-test-boundp purported-test))
-                              (ert-get-test purported-test))
-                      (ert-test purported-test)))
-                  operands))
-         (eql
-          (assert (eql (length operands) 1))
-          (ert-select-tests `(member ,@operands) universe))
-         (and
-          ;; Do these definitions of AND, NOT and OR satisfy de
-          ;; Morgan's laws?  Should they?
-          (case (length operands)
-            (0 (ert-select-tests 't universe))
-            (t (ert-select-tests `(and ,@(rest operands))
-                                 (ert-select-tests (first operands)
-                                                   universe)))))
-         (not
-          (assert (eql (length operands) 1))
-          (let ((all-tests (ert-select-tests 't universe)))
-            (ert--set-difference all-tests
-                                 (ert-select-tests (first operands)
-                                                   all-tests))))
-         (or
-          (case (length operands)
-            (0 (ert-select-tests 'nil universe))
-            (t (ert--union (ert-select-tests (first operands) universe)
-                           (ert-select-tests `(or ,@(rest operands))
-                                             universe)))))
-         (tag
-          (assert (eql (length operands) 1))
-          (let ((tag (first operands)))
-            (ert-select-tests `(satisfies
-                                ,(lambda (test)
-                                   (member tag (ert-test-tags test))))
-                              universe)))
-         (satisfies
-          (assert (eql (length operands) 1))
-          (ert--remove-if-not (first operands)
-                              (ert-select-tests 't universe))))))))
-
-(defun ert--insert-human-readable-selector (selector)
-  "Insert a human-readable presentation of SELECTOR into the current buffer."
-  ;; This is needed to avoid printing the (huge) contents of the
-  ;; `backtrace' slot of the result objects in the
-  ;; `most-recent-result' slots of test case objects in (eql ...) or
-  ;; (member ...) selectors.
-  (labels ((rec (selector)
-             ;; This code needs to match the etypecase in `ert-select-tests'.
-             (etypecase selector
-               ((or (member nil t
-                            :new :failed :passed
-                            :expected :unexpected)
-                    string
-                    symbol)
-                selector)
-               (ert-test
-                (if (ert-test-name selector)
-                    (make-symbol (format "<%S>" (ert-test-name selector)))
-                  (make-symbol "<unnamed test>")))
-               (cons
-                (destructuring-bind (operator &rest operands) selector
-                  (ecase operator
-                    ((member eql and not or)
-                     `(,operator ,@(mapcar #'rec operands)))
-                    ((member tag satisfies)
-                     selector)))))))
-    (insert (format "%S" (rec selector)))))
-
-
-;;; Facilities for running a whole set of tests.
-
-;; The data structure that contains the set of tests being executed
-;; during one particular test run, their results, the state of the
-;; execution, and some statistics.
-;;
-;; The data about results and expected results of tests may seem
-;; redundant here, since the test objects also carry such information.
-;; However, the information in the test objects may be more recent, it
-;; may correspond to a different test run.  We need the information
-;; that corresponds to this run in order to be able to update the
-;; statistics correctly when a test is re-run interactively and has a
-;; different result than before.
-(defstruct ert--stats
-  (selector (assert nil))
-  ;; The tests, in order.
-  (tests (assert nil) :type vector)
-  ;; A map of test names (or the test objects themselves for unnamed
-  ;; tests) to indices into the `tests' vector.
-  (test-map (assert nil) :type hash-table)
-  ;; The results of the tests during this run, in order.
-  (test-results (assert nil) :type vector)
-  ;; The start times of the tests, in order, as reported by
-  ;; `current-time'.
-  (test-start-times (assert nil) :type vector)
-  ;; The end times of the tests, in order, as reported by
-  ;; `current-time'.
-  (test-end-times (assert nil) :type vector)
-  (passed-expected 0)
-  (passed-unexpected 0)
-  (failed-expected 0)
-  (failed-unexpected 0)
-  (start-time nil)
-  (end-time nil)
-  (aborted-p nil)
-  (current-test nil)
-  ;; The time at or after which the next redisplay should occur, as a
-  ;; float.
-  (next-redisplay 0.0))
-
-(defun ert-stats-completed-expected (stats)
-  "Return the number of tests in STATS that had expected results."
-  (+ (ert--stats-passed-expected stats)
-     (ert--stats-failed-expected stats)))
-
-(defun ert-stats-completed-unexpected (stats)
-  "Return the number of tests in STATS that had unexpected results."
-  (+ (ert--stats-passed-unexpected stats)
-     (ert--stats-failed-unexpected stats)))
-
-(defun ert-stats-completed (stats)
-  "Number of tests in STATS that have run so far."
-  (+ (ert-stats-completed-expected stats)
-     (ert-stats-completed-unexpected stats)))
-
-(defun ert-stats-total (stats)
-  "Number of tests in STATS, regardless of whether they have run yet."
-  (length (ert--stats-tests stats)))
-
-;; The stats object of the current run, dynamically bound.  This is
-;; used for the mode line progress indicator.
-(defvar ert--current-run-stats nil)
-
-(defun ert--stats-test-key (test)
-  "Return the key used for TEST in the test map of ert--stats objects.
-
-Returns the name of TEST if it has one, or TEST itself otherwise."
-  (or (ert-test-name test) test))
-
-(defun ert--stats-set-test-and-result (stats pos test result)
-  "Change STATS by replacing the test at position POS with TEST and RESULT.
-
-Also changes the counters in STATS to match."
-  (let* ((tests (ert--stats-tests stats))
-         (results (ert--stats-test-results stats))
-         (old-test (aref tests pos))
-         (map (ert--stats-test-map stats)))
-    (flet ((update (d)
-             (if (ert-test-result-expected-p (aref tests pos)
-                                             (aref results pos))
-                 (etypecase (aref results pos)
-                   (ert-test-passed (incf (ert--stats-passed-expected stats) 
d))
-                   (ert-test-failed (incf (ert--stats-failed-expected stats) 
d))
-                   (null)
-                   (ert-test-aborted-with-non-local-exit))
-               (etypecase (aref results pos)
-                 (ert-test-passed (incf (ert--stats-passed-unexpected stats) 
d))
-                 (ert-test-failed (incf (ert--stats-failed-unexpected stats) 
d))
-                 (null)
-                 (ert-test-aborted-with-non-local-exit)))))
-      ;; Adjust counters to remove the result that is currently in stats.
-      (update -1)
-      ;; Put new test and result into stats.
-      (setf (aref tests pos) test
-            (aref results pos) result)
-      (remhash (ert--stats-test-key old-test) map)
-      (setf (gethash (ert--stats-test-key test) map) pos)
-      ;; Adjust counters to match new result.
-      (update +1)
-      nil)))
-
-(defun ert--make-stats (tests selector)
-  "Create a new `ert--stats' object for running TESTS.
-
-SELECTOR is the selector that was used to select TESTS."
-  (setq tests (ert--coerce-to-vector tests))
-  (let ((map (make-hash-table :size (length tests))))
-    (loop for i from 0
-          for test across tests
-          for key = (ert--stats-test-key test) do
-          (assert (not (gethash key map)))
-          (setf (gethash key map) i))
-    (make-ert--stats :selector selector
-                     :tests tests
-                     :test-map map
-                     :test-results (make-vector (length tests) nil)
-                     :test-start-times (make-vector (length tests) nil)
-                     :test-end-times (make-vector (length tests) nil))))
-
-(defun ert-run-or-rerun-test (stats test listener)
-  ;; checkdoc-order: nil
-  "Run the single test TEST and record the result using STATS and LISTENER."
-  (let ((ert--current-run-stats stats)
-        (pos (ert--stats-test-pos stats test)))
-    (ert--stats-set-test-and-result stats pos test nil)
-    ;; Call listener after setting/before resetting
-    ;; (ert--stats-current-test stats); the listener might refresh the
-    ;; mode line display, and if the value is not set yet/any more
-    ;; during this refresh, the mode line will flicker unnecessarily.
-    (setf (ert--stats-current-test stats) test)
-    (funcall listener 'test-started stats test)
-    (setf (ert-test-most-recent-result test) nil)
-    (setf (aref (ert--stats-test-start-times stats) pos) (current-time))
-    (unwind-protect
-        (ert-run-test test)
-      (setf (aref (ert--stats-test-end-times stats) pos) (current-time))
-      (let ((result (ert-test-most-recent-result test)))
-        (ert--stats-set-test-and-result stats pos test result)
-        (funcall listener 'test-ended stats test result))
-      (setf (ert--stats-current-test stats) nil))))
-
-(defun ert-run-tests (selector listener)
-  "Run the tests specified by SELECTOR, sending progress updates to LISTENER."
-  (let* ((tests (ert-select-tests selector t))
-         (stats (ert--make-stats tests selector)))
-    (setf (ert--stats-start-time stats) (current-time))
-    (funcall listener 'run-started stats)
-    (let ((abortedp t))
-      (unwind-protect
-          (let ((ert--current-run-stats stats))
-            (force-mode-line-update)
-            (unwind-protect
-                (progn
-                  (loop for test in tests do
-                        (ert-run-or-rerun-test stats test listener))
-                  (setq abortedp nil))
-              (setf (ert--stats-aborted-p stats) abortedp)
-              (setf (ert--stats-end-time stats) (current-time))
-              (funcall listener 'run-ended stats abortedp)))
-        (force-mode-line-update))
-      stats)))
-
-(defun ert--stats-test-pos (stats test)
-  ;; checkdoc-order: nil
-  "Return the position (index) of TEST in the run represented by STATS."
-  (gethash (ert--stats-test-key test) (ert--stats-test-map stats)))
-
-
-;;; Formatting functions shared across UIs.
-
-(defun ert--format-time-iso8601 (time)
-  "Format TIME in the variant of ISO 8601 used for timestamps in ERT."
-  (format-time-string "%Y-%m-%d %T%z" time))
-
-(defun ert-char-for-test-result (result expectedp)
-  "Return a character that represents the test result RESULT.
-
-EXPECTEDP specifies whether the result was expected."
-  (let ((s (etypecase result
-             (ert-test-passed ".P")
-             (ert-test-failed "fF")
-             (null "--")
-             (ert-test-aborted-with-non-local-exit "aA"))))
-    (elt s (if expectedp 0 1))))
-
-(defun ert-string-for-test-result (result expectedp)
-  "Return a string that represents the test result RESULT.
-
-EXPECTEDP specifies whether the result was expected."
-  (let ((s (etypecase result
-             (ert-test-passed '("passed" "PASSED"))
-             (ert-test-failed '("failed" "FAILED"))
-             (null '("unknown" "UNKNOWN"))
-             (ert-test-aborted-with-non-local-exit '("aborted" "ABORTED")))))
-    (elt s (if expectedp 0 1))))
-
-(defun ert--pp-with-indentation-and-newline (object)
-  "Pretty-print OBJECT, indenting it to the current column of point.
-Ensures a final newline is inserted."
-  (let ((begin (point)))
-    (pp object (current-buffer))
-    (unless (bolp) (insert "\n"))
-    (save-excursion
-      (goto-char begin)
-      (indent-sexp))))
-
-(defun ert--insert-infos (result)
-  "Insert `ert-info' infos from RESULT into current buffer.
-
-RESULT must be an `ert-test-result-with-condition'."
-  (check-type result ert-test-result-with-condition)
-  (dolist (info (ert-test-result-with-condition-infos result))
-    (destructuring-bind (prefix . message) info
-      (let ((begin (point))
-            (indentation (make-string (+ (length prefix) 4) ?\s))
-            (end nil))
-        (unwind-protect
-            (progn
-              (insert message "\n")
-              (setq end (copy-marker (point)))
-              (goto-char begin)
-              (insert "    " prefix)
-              (forward-line 1)
-              (while (< (point) end)
-                (insert indentation)
-                (forward-line 1)))
-          (when end (set-marker end nil)))))))
-
-
-;;; Running tests in batch mode.
-
-(defvar ert-batch-backtrace-right-margin 70
-  "*The maximum line length for printing backtraces in `ert-run-tests-batch'.")
-
-;;;###autoload
-(defun ert-run-tests-batch (&optional selector)
-  "Run the tests specified by SELECTOR, printing results to the terminal.
-
-SELECTOR works as described in `ert-select-tests', except if
-SELECTOR is nil, in which case all tests rather than none will be
-run; this makes the command line \"emacs -batch -l my-tests.el -f
-ert-run-tests-batch-and-exit\" useful.
-
-Returns the stats object."
-  (unless selector (setq selector 't))
-  (ert-run-tests
-   selector
-   (lambda (event-type &rest event-args)
-     (ecase event-type
-       (run-started
-        (destructuring-bind (stats) event-args
-          (message "Running %s tests (%s)"
-                   (length (ert--stats-tests stats))
-                   (ert--format-time-iso8601 (ert--stats-start-time stats)))))
-       (run-ended
-        (destructuring-bind (stats abortedp) event-args
-          (let ((unexpected (ert-stats-completed-unexpected stats))
-                (expected-failures (ert--stats-failed-expected stats)))
-            (message "\n%sRan %s tests, %s results as expected%s (%s)%s\n"
-                     (if (not abortedp)
-                         ""
-                       "Aborted: ")
-                     (ert-stats-total stats)
-                     (ert-stats-completed-expected stats)
-                     (if (zerop unexpected)
-                         ""
-                       (format ", %s unexpected" unexpected))
-                     (ert--format-time-iso8601 (ert--stats-end-time stats))
-                     (if (zerop expected-failures)
-                         ""
-                       (format "\n%s expected failures" expected-failures)))
-            (unless (zerop unexpected)
-              (message "%s unexpected results:" unexpected)
-              (loop for test across (ert--stats-tests stats)
-                    for result = (ert-test-most-recent-result test) do
-                    (when (not (ert-test-result-expected-p test result))
-                      (message "%9s  %S"
-                               (ert-string-for-test-result result nil)
-                               (ert-test-name test))))
-              (message "%s" "")))))
-       (test-started
-        )
-       (test-ended
-        (destructuring-bind (stats test result) event-args
-          (unless (ert-test-result-expected-p test result)
-            (etypecase result
-              (ert-test-passed
-               (message "Test %S passed unexpectedly" (ert-test-name test)))
-              (ert-test-result-with-condition
-               (message "Test %S backtrace:" (ert-test-name test))
-               (with-temp-buffer
-                 (ert--print-backtrace 
(ert-test-result-with-condition-backtrace
-                                        result))
-                 (goto-char (point-min))
-                 (while (not (eobp))
-                   (let ((start (point))
-                         (end (progn (end-of-line) (point))))
-                     (setq end (min end
-                                    (+ start 
ert-batch-backtrace-right-margin)))
-                     (message "%s" (buffer-substring-no-properties
-                                    start end)))
-                   (forward-line 1)))
-               (with-temp-buffer
-                 (ert--insert-infos result)
-                 (insert "    ")
-                 (let ((print-escape-newlines t)
-                       (print-level 5)
-                       (print-length 10))
-                   (let ((begin (point)))
-                     (ert--pp-with-indentation-and-newline
-                      (ert-test-result-with-condition-condition result))))
-                 (goto-char (1- (point-max)))
-                 (assert (looking-at "\n"))
-                 (delete-char 1)
-                 (message "Test %S condition:" (ert-test-name test))
-                 (message "%s" (buffer-string))))
-              (ert-test-aborted-with-non-local-exit
-               (message "Test %S aborted with non-local exit"
-                        (ert-test-name test)))))
-          (let* ((max (prin1-to-string (length (ert--stats-tests stats))))
-                 (format-string (concat "%9s  %"
-                                        (prin1-to-string (length max))
-                                        "s/" max "  %S")))
-            (message format-string
-                     (ert-string-for-test-result result
-                                                 (ert-test-result-expected-p
-                                                  test result))
-                     (1+ (ert--stats-test-pos stats test))
-                     (ert-test-name test)))))))))
-
-;;;###autoload
-(defun ert-run-tests-batch-and-exit (&optional selector)
-  "Like `ert-run-tests-batch', but exits Emacs when done.
-
-The exit status will be 0 if all test results were as expected, 1
-on unexpected results, or 2 if the framework detected an error
-outside of the tests (e.g. invalid SELECTOR or bug in the code
-that runs the tests)."
-  (unwind-protect
-      (let ((stats (ert-run-tests-batch selector)))
-        (kill-emacs (if (zerop (ert-stats-completed-unexpected stats)) 0 1)))
-    (unwind-protect
-        (progn
-          (message "Error running tests")
-          (backtrace))
-      (kill-emacs 2))))
-
-
-;;; Utility functions for load/unload actions.
-
-(defun ert--activate-font-lock-keywords ()
-  "Activate font-lock keywords for some of ERT's symbols."
-  (font-lock-add-keywords
-   nil
-   '(("(\\(\\<ert-deftest\\)\\>\\s *\\(\\sw+\\)?"
-      (1 font-lock-keyword-face nil t)
-      (2 font-lock-function-name-face nil t)))))
-
-(defun* ert--remove-from-list (list-var element &key key test)
-  "Remove ELEMENT from the value of LIST-VAR if present.
-
-This can be used as an inverse of `add-to-list'."
-  (unless key (setq key #'identity))
-  (unless test (setq test #'equal))
-  (setf (symbol-value list-var)
-        (ert--remove* element
-                      (symbol-value list-var)
-                      :key key
-                      :test test)))
-
-
-;;; Some basic interactive functions.
-
-(defun ert-read-test-name (prompt &optional default history
-                                  add-default-to-prompt)
-  "Read the name of a test and return it as a symbol.
-
-Prompt with PROMPT.  If DEFAULT is a valid test name, use it as a
-default.  HISTORY is the history to use; see `completing-read'.
-If ADD-DEFAULT-TO-PROMPT is non-nil, PROMPT will be modified to
-include the default, if any.
-
-Signals an error if no test name was read."
-  (etypecase default
-    (string (let ((symbol (intern-soft default)))
-              (unless (and symbol (ert-test-boundp symbol))
-                (setq default nil))))
-    (symbol (setq default
-                  (if (ert-test-boundp default)
-                      (symbol-name default)
-                    nil)))
-    (ert-test (setq default (ert-test-name default))))
-  (when add-default-to-prompt
-    (setq prompt (if (null default)
-                     (format "%s: " prompt)
-                   (format "%s (default %s): " prompt default))))
-  (let ((input (completing-read prompt obarray #'ert-test-boundp
-                                t nil history default nil)))
-    ;; completing-read returns an empty string if default was nil and
-    ;; the user just hit enter.
-    (let ((sym (intern-soft input)))
-      (if (ert-test-boundp sym)
-          sym
-        (error "Input does not name a test")))))
-
-(defun ert-read-test-name-at-point (prompt)
-  "Read the name of a test and return it as a symbol.
-As a default, use the symbol at point, or the test at point if in
-the ERT results buffer.  Prompt with PROMPT, augmented with the
-default (if any)."
-  (ert-read-test-name prompt (ert-test-at-point) nil t))
-
-(defun ert-find-test-other-window (test-name)
-  "Find, in another window, the definition of TEST-NAME."
-  (interactive (list (ert-read-test-name-at-point "Find test definition: ")))
-  (find-function-do-it test-name 'ert-deftest 'switch-to-buffer-other-window))
-
-(defun ert-delete-test (test-name)
-  "Make the test TEST-NAME unbound.
-
-Nothing more than an interactive interface to `ert-make-test-unbound'."
-  (interactive (list (ert-read-test-name-at-point "Delete test")))
-  (ert-make-test-unbound test-name))
-
-(defun ert-delete-all-tests ()
-  "Make all symbols in `obarray' name no test."
-  (interactive)
-  (when (interactive-p)
-    (unless (y-or-n-p "Delete all tests? ")
-      (error "Aborted")))
-  ;; We can't use `ert-select-tests' here since that gives us only
-  ;; test objects, and going from them back to the test name symbols
-  ;; can fail if the `ert-test' defstruct has been redefined.
-  (mapc #'ert-make-test-unbound (apropos-internal "" #'ert-test-boundp))
-  t)
-
-
-;;; Display of test progress and results.
-
-;; An entry in the results buffer ewoc.  There is one entry per test.
-(defstruct ert--ewoc-entry
-  (test (assert nil))
-  ;; If the result of this test was expected, its ewoc entry is hidden
-  ;; initially.
-  (hidden-p (assert nil))
-  ;; An ewoc entry may be collapsed to hide details such as the error
-  ;; condition.
-  ;;
-  ;; I'm not sure the ability to expand and collapse entries is still
-  ;; a useful feature.
-  (expanded-p t)
-  ;; By default, the ewoc entry presents the error condition with
-  ;; certain limits on how much to print (`print-level',
-  ;; `print-length').  The user can interactively switch to a set of
-  ;; higher limits.
-  (extended-printer-limits-p nil))
-
-;; Variables local to the results buffer.
-
-;; The ewoc.
-(defvar ert--results-ewoc)
-;; The stats object.
-(defvar ert--results-stats)
-;; A string with one character per test.  Each character represents
-;; the result of the corresponding test.  The string is displayed near
-;; the top of the buffer and serves as a progress bar.
-(defvar ert--results-progress-bar-string)
-;; The position where the progress bar button begins.
-(defvar ert--results-progress-bar-button-begin)
-;; The test result listener that updates the buffer when tests are run.
-(defvar ert--results-listener)
-
-(defun ert-insert-test-name-button (test-name)
-  "Insert a button that links to TEST-NAME."
-  (insert-text-button (format "%S" test-name)
-                      :type 'ert--test-name-button
-                      'ert-test-name test-name))
-
-(defun ert--results-format-expected-unexpected (expected unexpected)
-  "Return a string indicating EXPECTED expected results, UNEXPECTED 
unexpected."
-  (if (zerop unexpected)
-      (format "%s" expected)
-    (format "%s (%s unexpected)" (+ expected unexpected) unexpected)))
-
-(defun ert--results-update-ewoc-hf (ewoc stats)
-  "Update the header and footer of EWOC to show certain information from STATS.
-
-Also sets `ert--results-progress-bar-button-begin'."
-  (let ((run-count (ert-stats-completed stats))
-        (results-buffer (current-buffer))
-        ;; Need to save buffer-local value.
-        (font-lock font-lock-mode))
-    (ewoc-set-hf
-     ewoc
-     ;; header
-     (with-temp-buffer
-       (insert "Selector: ")
-       (ert--insert-human-readable-selector (ert--stats-selector stats))
-       (insert "\n")
-       (insert
-        (format (concat "Passed: %s\n"
-                        "Failed: %s\n"
-                        "Total:  %s/%s\n\n")
-                (ert--results-format-expected-unexpected
-                 (ert--stats-passed-expected stats)
-                 (ert--stats-passed-unexpected stats))
-                (ert--results-format-expected-unexpected
-                 (ert--stats-failed-expected stats)
-                 (ert--stats-failed-unexpected stats))
-                run-count
-                (ert-stats-total stats)))
-       (insert
-        (format "Started at:   %s\n"
-                (ert--format-time-iso8601 (ert--stats-start-time stats))))
-       ;; FIXME: This is ugly.  Need to properly define invariants of
-       ;; the `stats' data structure.
-       (let ((state (cond ((ert--stats-aborted-p stats) 'aborted)
-                          ((ert--stats-current-test stats) 'running)
-                          ((ert--stats-end-time stats) 'finished)
-                          (t 'preparing))))
-         (ecase state
-           (preparing
-            (insert ""))
-           (aborted
-            (cond ((ert--stats-current-test stats)
-                   (insert "Aborted during test: ")
-                   (ert-insert-test-name-button
-                    (ert-test-name (ert--stats-current-test stats))))
-                  (t
-                   (insert "Aborted."))))
-           (running
-            (assert (ert--stats-current-test stats))
-            (insert "Running test: ")
-            (ert-insert-test-name-button (ert-test-name
-                                          (ert--stats-current-test stats))))
-           (finished
-            (assert (not (ert--stats-current-test stats)))
-            (insert "Finished.")))
-         (insert "\n")
-         (if (ert--stats-end-time stats)
-             (insert
-              (format "%s%s\n"
-                      (if (ert--stats-aborted-p stats)
-                          "Aborted at:   "
-                        "Finished at:  ")
-                      (ert--format-time-iso8601 (ert--stats-end-time stats))))
-           (insert "\n"))
-         (insert "\n"))
-       (let ((progress-bar-string (with-current-buffer results-buffer
-                                    ert--results-progress-bar-string)))
-         (let ((progress-bar-button-begin
-                (insert-text-button progress-bar-string
-                                    :type 'ert--results-progress-bar-button
-                                    'face (or (and font-lock
-                                                   (ert-face-for-stats stats))
-                                              'button))))
-           ;; The header gets copied verbatim to the results buffer,
-           ;; and all positions remain the same, so
-           ;; `progress-bar-button-begin' will be the right position
-           ;; even in the results buffer.
-           (with-current-buffer results-buffer
-             (set (make-local-variable 'ert--results-progress-bar-button-begin)
-                  progress-bar-button-begin))))
-       (insert "\n\n")
-       (buffer-string))
-     ;; footer
-     ;;
-     ;; We actually want an empty footer, but that would trigger a bug
-     ;; in ewoc, sometimes clearing the entire buffer.  (It's possible
-     ;; that this bug has been fixed since this has been tested; we
-     ;; should test it again.)
-     "\n")))
-
-
-(defvar ert-test-run-redisplay-interval-secs .1
-  "How many seconds ERT should wait between redisplays while running tests.
-
-While running tests, ERT shows the current progress, and this variable
-determines how frequently the progress display is updated.")
-
-(defun ert--results-update-stats-display (ewoc stats)
-  "Update EWOC and the mode line to show data from STATS."
-  ;; TODO(ohler): investigate using `make-progress-reporter'.
-  (ert--results-update-ewoc-hf ewoc stats)
-  (force-mode-line-update)
-  (redisplay t)
-  (setf (ert--stats-next-redisplay stats)
-        (+ (float-time) ert-test-run-redisplay-interval-secs)))
-
-(defun ert--results-update-stats-display-maybe (ewoc stats)
-  "Call `ert--results-update-stats-display' if not called recently.
-
-EWOC and STATS are arguments for `ert--results-update-stats-display'."
-  (when (>= (float-time) (ert--stats-next-redisplay stats))
-    (ert--results-update-stats-display ewoc stats)))
-
-(defun ert--tests-running-mode-line-indicator ()
-  "Return a string for the mode line that shows the test run progress."
-  (let* ((stats ert--current-run-stats)
-         (tests-total (ert-stats-total stats))
-         (tests-completed (ert-stats-completed stats)))
-    (if (>= tests-completed tests-total)
-        (format " ERT(%s/%s,finished)" tests-completed tests-total)
-      (format " ERT(%s/%s):%s"
-              (1+ tests-completed)
-              tests-total
-              (if (null (ert--stats-current-test stats))
-                  "?"
-                (format "%S"
-                        (ert-test-name (ert--stats-current-test stats))))))))
-
-(defun ert--make-xrefs-region (begin end)
-  "Attach cross-references to function names between BEGIN and END.
-
-BEGIN and END specify a region in the current buffer."
-  (save-excursion
-    (save-restriction
-      (narrow-to-region begin (point))
-      ;; Inhibit optimization in `debugger-make-xrefs' that would
-      ;; sometimes insert unrelated backtrace info into our buffer.
-      (let ((debugger-previous-backtrace nil))
-        (debugger-make-xrefs)))))
-
-(defun ert--string-first-line (s)
-  "Return the first line of S, or S if it contains no newlines.
-
-The return value does not include the line terminator."
-  (substring s 0 (ert--string-position ?\n s)))
-
-(defun ert-face-for-test-result (expectedp)
-  "Return a face that shows whether a test result was expected or unexpected.
-
-If EXPECTEDP is nil, returns the face for unexpected results; if
-non-nil, returns the face for expected results.."
-  (if expectedp 'ert-test-result-expected 'ert-test-result-unexpected))
-
-(defun ert-face-for-stats (stats)
-  "Return a face that represents STATS."
-  (cond ((ert--stats-aborted-p stats) 'nil)
-        ((plusp (ert-stats-completed-unexpected stats))
-         (ert-face-for-test-result nil))
-        ((eql (ert-stats-completed-expected stats) (ert-stats-total stats))
-         (ert-face-for-test-result t))
-        (t 'nil)))
-
-(defun ert--print-test-for-ewoc (entry)
-  "The ewoc print function for ewoc test entries.  ENTRY is the entry to 
print."
-  (let* ((test (ert--ewoc-entry-test entry))
-         (stats ert--results-stats)
-         (result (let ((pos (ert--stats-test-pos stats test)))
-                   (assert pos)
-                   (aref (ert--stats-test-results stats) pos)))
-         (hiddenp (ert--ewoc-entry-hidden-p entry))
-         (expandedp (ert--ewoc-entry-expanded-p entry))
-         (extended-printer-limits-p (ert--ewoc-entry-extended-printer-limits-p
-                                     entry)))
-    (cond (hiddenp)
-          (t
-           (let ((expectedp (ert-test-result-expected-p test result)))
-             (insert-text-button (format "%c" (ert-char-for-test-result
-                                               result expectedp))
-                                 :type 'ert--results-expand-collapse-button
-                                 'face (or (and font-lock-mode
-                                                (ert-face-for-test-result
-                                                 expectedp))
-                                           'button)))
-           (insert " ")
-           (ert-insert-test-name-button (ert-test-name test))
-           (insert "\n")
-           (when (and expandedp (not (eql result 'nil)))
-             (when (ert-test-documentation test)
-               (insert "    "
-                       (propertize
-                        (ert--string-first-line (ert-test-documentation test))
-                        'font-lock-face 'font-lock-doc-face)
-                       "\n"))
-             (etypecase result
-               (ert-test-passed
-                (if (ert-test-result-expected-p test result)
-                    (insert "    passed\n")
-                  (insert "    passed unexpectedly\n"))
-                (insert ""))
-               (ert-test-result-with-condition
-                (ert--insert-infos result)
-                (let ((print-escape-newlines t)
-                      (print-level (if extended-printer-limits-p 12 6))
-                      (print-length (if extended-printer-limits-p 100 10)))
-                  (insert "    ")
-                  (let ((begin (point)))
-                    (ert--pp-with-indentation-and-newline
-                     (ert-test-result-with-condition-condition result))
-                    (ert--make-xrefs-region begin (point)))))
-               (ert-test-aborted-with-non-local-exit
-                (insert "    aborted\n")))
-             (insert "\n")))))
-  nil)
-
-(defun ert--results-font-lock-function (enabledp)
-  "Redraw the ERT results buffer after font-lock-mode was switched on or off.
-
-ENABLEDP is true if font-lock-mode is switched on, false
-otherwise."
-  (ert--results-update-ewoc-hf ert--results-ewoc ert--results-stats)
-  (ewoc-refresh ert--results-ewoc)
-  (font-lock-default-function enabledp))
-
-(defun ert--setup-results-buffer (stats listener buffer-name)
-  "Set up a test results buffer.
-
-STATS is the stats object; LISTENER is the results listener;
-BUFFER-NAME, if non-nil, is the buffer name to use."
-  (unless buffer-name (setq buffer-name "*ert*"))
-  (let ((buffer (get-buffer-create buffer-name)))
-    (with-current-buffer buffer
-      (setq buffer-read-only t)
-      (let ((inhibit-read-only t))
-        (buffer-disable-undo)
-        (erase-buffer)
-        (ert-results-mode)
-        ;; Erase buffer again in case switching out of the previous
-        ;; mode inserted anything.  (This happens e.g. when switching
-        ;; from ert-results-mode to ert-results-mode when
-        ;; font-lock-mode turns itself off in change-major-mode-hook.)
-        (erase-buffer)
-        (set (make-local-variable 'font-lock-function)
-             'ert--results-font-lock-function)
-        (let ((ewoc (ewoc-create 'ert--print-test-for-ewoc nil nil t)))
-          (set (make-local-variable 'ert--results-ewoc) ewoc)
-          (set (make-local-variable 'ert--results-stats) stats)
-          (set (make-local-variable 'ert--results-progress-bar-string)
-               (make-string (ert-stats-total stats)
-                            (ert-char-for-test-result nil t)))
-          (set (make-local-variable 'ert--results-listener) listener)
-          (loop for test across (ert--stats-tests stats) do
-                (ewoc-enter-last ewoc
-                                 (make-ert--ewoc-entry :test test :hidden-p 
t)))
-          (ert--results-update-ewoc-hf ert--results-ewoc ert--results-stats)
-          (goto-char (1- (point-max)))
-          buffer)))))
-
-
-(defvar ert--selector-history nil
-  "List of recent test selectors read from terminal.")
-
-;; Should OUTPUT-BUFFER-NAME and MESSAGE-FN really be arguments here?
-;; They are needed only for our automated self-tests at the moment.
-;; Or should there be some other mechanism?
-;;;###autoload
-(defun ert-run-tests-interactively (selector
-                                    &optional output-buffer-name message-fn)
-  "Run the tests specified by SELECTOR and display the results in a buffer.
-
-SELECTOR works as described in `ert-select-tests'.
-OUTPUT-BUFFER-NAME and MESSAGE-FN should normally be nil; they
-are used for automated self-tests and specify which buffer to use
-and how to display message."
-  (interactive
-   (list (let ((default (if ert--selector-history
-                            ;; Can't use `first' here as this form is
-                            ;; not compiled, and `first' is not
-                            ;; defined without cl.
-                            (car ert--selector-history)
-                          "t")))
-           (read-from-minibuffer (if (null default)
-                                     "Run tests: "
-                                   (format "Run tests (default %s): " default))
-                                 nil nil t 'ert--selector-history
-                                 default nil))
-         nil))
-  (unless message-fn (setq message-fn 'message))
-  (lexical-let ((output-buffer-name output-buffer-name)
-                buffer
-                listener
-                (message-fn message-fn))
-    (setq listener
-          (lambda (event-type &rest event-args)
-            (ecase event-type
-              (run-started
-               (destructuring-bind (stats) event-args
-                 (setq buffer (ert--setup-results-buffer stats
-                                                         listener
-                                                         output-buffer-name))
-                 (pop-to-buffer buffer)))
-              (run-ended
-               (destructuring-bind (stats abortedp) event-args
-                 (funcall message-fn
-                          "%sRan %s tests, %s results were as expected%s"
-                          (if (not abortedp)
-                              ""
-                            "Aborted: ")
-                          (ert-stats-total stats)
-                          (ert-stats-completed-expected stats)
-                          (let ((unexpected
-                                 (ert-stats-completed-unexpected stats)))
-                            (if (zerop unexpected)
-                                ""
-                              (format ", %s unexpected" unexpected))))
-                 (ert--results-update-stats-display (with-current-buffer buffer
-                                                      ert--results-ewoc)
-                                                    stats)))
-              (test-started
-               (destructuring-bind (stats test) event-args
-                 (with-current-buffer buffer
-                   (let* ((ewoc ert--results-ewoc)
-                          (pos (ert--stats-test-pos stats test))
-                          (node (ewoc-nth ewoc pos)))
-                     (assert node)
-                     (setf (ert--ewoc-entry-test (ewoc-data node)) test)
-                     (aset ert--results-progress-bar-string pos
-                           (ert-char-for-test-result nil t))
-                     (ert--results-update-stats-display-maybe ewoc stats)
-                     (ewoc-invalidate ewoc node)))))
-              (test-ended
-               (destructuring-bind (stats test result) event-args
-                 (with-current-buffer buffer
-                   (let* ((ewoc ert--results-ewoc)
-                          (pos (ert--stats-test-pos stats test))
-                          (node (ewoc-nth ewoc pos)))
-                     (when (ert--ewoc-entry-hidden-p (ewoc-data node))
-                       (setf (ert--ewoc-entry-hidden-p (ewoc-data node))
-                             (ert-test-result-expected-p test result)))
-                     (aset ert--results-progress-bar-string pos
-                           (ert-char-for-test-result result
-                                                     
(ert-test-result-expected-p
-                                                      test result)))
-                     (ert--results-update-stats-display-maybe ewoc stats)
-                     (ewoc-invalidate ewoc node))))))))
-    (ert-run-tests
-     selector
-     listener)))
-;;;###autoload
-(defalias 'ert 'ert-run-tests-interactively)
-
-
-;;; Simple view mode for auxiliary information like stack traces or
-;;; messages.  Mainly binds "q" for quit.
-
-(define-derived-mode ert-simple-view-mode fundamental-mode "ERT-View"
-  "Major mode for viewing auxiliary information in ERT.")
-
-(loop for (key binding) in
-      '(("q" quit-window)
-        )
-      do
-      (define-key ert-simple-view-mode-map key binding))
-
-
-;;; Commands and button actions for the results buffer.
-
-(define-derived-mode ert-results-mode fundamental-mode "ERT-Results"
-  "Major mode for viewing results of ERT test runs.")
-
-(loop for (key binding) in
-      '(;; Stuff that's not in the menu.
-        ("\t" forward-button)
-        ([backtab] backward-button)
-        ("j" ert-results-jump-between-summary-and-result)
-        ("q" quit-window)
-        ("L" ert-results-toggle-printer-limits-for-test-at-point)
-        ("n" ert-results-next-test)
-        ("p" ert-results-previous-test)
-        ;; Stuff that is in the menu.
-        ("R" ert-results-rerun-all-tests)
-        ("r" ert-results-rerun-test-at-point)
-        ("d" ert-results-rerun-test-at-point-debugging-errors)
-        ("." ert-results-find-test-at-point-other-window)
-        ("b" ert-results-pop-to-backtrace-for-test-at-point)
-        ("m" ert-results-pop-to-messages-for-test-at-point)
-        ("l" ert-results-pop-to-should-forms-for-test-at-point)
-        ("h" ert-results-describe-test-at-point)
-        ("D" ert-delete-test)
-        ("T" ert-results-pop-to-timings)
-        )
-      do
-      (define-key ert-results-mode-map key binding))
-
-(easy-menu-define ert-results-mode-menu ert-results-mode-map
-  "Menu for `ert-results-mode'."
-  '("ERT Results"
-    ["Re-run all tests" ert-results-rerun-all-tests]
-    "--"
-    ["Re-run test" ert-results-rerun-test-at-point]
-    ["Debug test" ert-results-rerun-test-at-point-debugging-errors]
-    ["Show test definition" ert-results-find-test-at-point-other-window]
-    "--"
-    ["Show backtrace" ert-results-pop-to-backtrace-for-test-at-point]
-    ["Show messages" ert-results-pop-to-messages-for-test-at-point]
-    ["Show `should' forms" ert-results-pop-to-should-forms-for-test-at-point]
-    ["Describe test" ert-results-describe-test-at-point]
-    "--"
-    ["Delete test" ert-delete-test]
-    "--"
-    ["Show execution time of each test" ert-results-pop-to-timings]
-    ))
-
-(define-button-type 'ert--results-progress-bar-button
-  'action #'ert--results-progress-bar-button-action
-  'help-echo "mouse-2, RET: Reveal test result")
-
-(define-button-type 'ert--test-name-button
-  'action #'ert--test-name-button-action
-  'help-echo "mouse-2, RET: Find test definition")
-
-(define-button-type 'ert--results-expand-collapse-button
-  'action #'ert--results-expand-collapse-button-action
-  'help-echo "mouse-2, RET: Expand/collapse test result")
-
-(defun ert--results-test-node-or-null-at-point ()
-  "If point is on a valid ewoc node, return it; return nil otherwise.
-
-To be used in the ERT results buffer."
-  (let* ((ewoc ert--results-ewoc)
-         (node (ewoc-locate ewoc)))
-    ;; `ewoc-locate' will return an arbitrary node when point is on
-    ;; header or footer, or when all nodes are invisible.  So we need
-    ;; to validate its return value here.
-    ;;
-    ;; Update: I'm seeing nil being returned in some cases now,
-    ;; perhaps this has been changed?
-    (if (and node
-             (>= (point) (ewoc-location node))
-             (not (ert--ewoc-entry-hidden-p (ewoc-data node))))
-        node
-      nil)))
-
-(defun ert--results-test-node-at-point ()
-  "If point is on a valid ewoc node, return it; signal an error otherwise.
-
-To be used in the ERT results buffer."
-  (or (ert--results-test-node-or-null-at-point)
-      (error "No test at point")))
-
-(defun ert-results-next-test ()
-  "Move point to the next test.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (ert--results-move (ewoc-locate ert--results-ewoc) 'ewoc-next
-                     "No tests below"))
-
-(defun ert-results-previous-test ()
-  "Move point to the previous test.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (ert--results-move (ewoc-locate ert--results-ewoc) 'ewoc-prev
-                     "No tests above"))
-
-(defun ert--results-move (node ewoc-fn error-message)
-  "Move point from NODE to the previous or next node.
-
-EWOC-FN specifies the direction and should be either `ewoc-prev'
-or `ewoc-next'.  If there are no more nodes in that direction, an
-error is signalled with the message ERROR-MESSAGE."
-  (loop
-   (setq node (funcall ewoc-fn ert--results-ewoc node))
-   (when (null node)
-     (error "%s" error-message))
-   (unless (ert--ewoc-entry-hidden-p (ewoc-data node))
-     (goto-char (ewoc-location node))
-     (return))))
-
-(defun ert--results-expand-collapse-button-action (button)
-  "Expand or collapse the test node BUTTON belongs to."
-  (let* ((ewoc ert--results-ewoc)
-         (node (save-excursion
-                 (goto-char (ert--button-action-position))
-                 (ert--results-test-node-at-point)))
-         (entry (ewoc-data node)))
-    (setf (ert--ewoc-entry-expanded-p entry)
-          (not (ert--ewoc-entry-expanded-p entry)))
-    (ewoc-invalidate ewoc node)))
-
-(defun ert-results-find-test-at-point-other-window ()
-  "Find the definition of the test at point in another window.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (let ((name (ert-test-at-point)))
-    (unless name
-      (error "No test at point"))
-    (ert-find-test-other-window name)))
-
-(defun ert--test-name-button-action (button)
-  "Find the definition of the test BUTTON belongs to, in another window."
-  (let ((name (button-get button 'ert-test-name)))
-    (ert-find-test-other-window name)))
-
-(defun ert--ewoc-position (ewoc node)
-  ;; checkdoc-order: nil
-  "Return the position of NODE in EWOC, or nil if NODE is not in EWOC."
-  (loop for i from 0
-        for node-here = (ewoc-nth ewoc 0) then (ewoc-next ewoc node-here)
-        do (when (eql node node-here)
-             (return i))
-        finally (return nil)))
-
-(defun ert-results-jump-between-summary-and-result ()
-  "Jump back and forth between the test run summary and individual test 
results.
-
-From an ewoc node, jumps to the character that represents the
-same test in the progress bar, and vice versa.
-
-To be used in the ERT results buffer."
-  ;; Maybe this command isn't actually needed much, but if it is, it
-  ;; seems like an indication that the UI design is not optimal.  If
-  ;; jumping back and forth between a summary at the top of the buffer
-  ;; and the error log in the remainder of the buffer is useful, then
-  ;; the summary apparently needs to be easily accessible from the
-  ;; error log, and perhaps it would be better to have it in a
-  ;; separate buffer to keep it visible.
-  (interactive)
-  (let ((ewoc ert--results-ewoc)
-        (progress-bar-begin ert--results-progress-bar-button-begin))
-    (cond ((ert--results-test-node-or-null-at-point)
-           (let* ((node (ert--results-test-node-at-point))
-                  (pos (ert--ewoc-position ewoc node)))
-             (goto-char (+ progress-bar-begin pos))))
-          ((and (<= progress-bar-begin (point))
-                (< (point) (button-end (button-at progress-bar-begin))))
-           (let* ((node (ewoc-nth ewoc (- (point) progress-bar-begin)))
-                  (entry (ewoc-data node)))
-             (when (ert--ewoc-entry-hidden-p entry)
-               (setf (ert--ewoc-entry-hidden-p entry) nil)
-               (ewoc-invalidate ewoc node))
-             (ewoc-goto-node ewoc node)))
-          (t
-           (goto-char progress-bar-begin)))))
-
-(defun ert-test-at-point ()
-  "Return the name of the test at point as a symbol, or nil if none."
-  (or (and (eql major-mode 'ert-results-mode)
-           (let ((test (ert--results-test-at-point-no-redefinition)))
-             (and test (ert-test-name test))))
-      (let* ((thing (thing-at-point 'symbol))
-             (sym (intern-soft thing)))
-        (and (ert-test-boundp sym)
-             sym))))
-
-(defun ert--results-test-at-point-no-redefinition ()
-  "Return the test at point, or nil.
-
-To be used in the ERT results buffer."
-  (assert (eql major-mode 'ert-results-mode))
-  (if (ert--results-test-node-or-null-at-point)
-      (let* ((node (ert--results-test-node-at-point))
-             (test (ert--ewoc-entry-test (ewoc-data node))))
-        test)
-    (let ((progress-bar-begin ert--results-progress-bar-button-begin))
-      (when (and (<= progress-bar-begin (point))
-                 (< (point) (button-end (button-at progress-bar-begin))))
-        (let* ((test-index (- (point) progress-bar-begin))
-               (test (aref (ert--stats-tests ert--results-stats)
-                           test-index)))
-          test)))))
-
-(defun ert--results-test-at-point-allow-redefinition ()
-  "Look up the test at point, and check whether it has been redefined.
-
-To be used in the ERT results buffer.
-
-Returns a list of two elements: the test (or nil) and a symbol
-specifying whether the test has been redefined.
-
-If a new test has been defined with the same name as the test at
-point, replaces the test at point with the new test, and returns
-the new test and the symbol `redefined'.
-
-If the test has been deleted, returns the old test and the symbol
-`deleted'.
-
-If the test is still current, returns the test and the symbol nil.
-
-If there is no test at point, returns a list with two nils."
-  (let ((test (ert--results-test-at-point-no-redefinition)))
-    (cond ((null test)
-           `(nil nil))
-          ((null (ert-test-name test))
-           `(,test nil))
-          (t
-           (let* ((name (ert-test-name test))
-                  (new-test (and (ert-test-boundp name)
-                                 (ert-get-test name))))
-             (cond ((eql test new-test)
-                    `(,test nil))
-                   ((null new-test)
-                    `(,test deleted))
-                   (t
-                    (ert--results-update-after-test-redefinition
-                     (ert--stats-test-pos ert--results-stats test)
-                     new-test)
-                    `(,new-test redefined))))))))
-
-(defun ert--results-update-after-test-redefinition (pos new-test)
-  "Update results buffer after the test at pos POS has been redefined.
-
-Also updates the stats object.  NEW-TEST is the new test
-definition."
-  (let* ((stats ert--results-stats)
-         (ewoc ert--results-ewoc)
-         (node (ewoc-nth ewoc pos))
-         (entry (ewoc-data node)))
-    (ert--stats-set-test-and-result stats pos new-test nil)
-    (setf (ert--ewoc-entry-test entry) new-test
-          (aref ert--results-progress-bar-string pos) (ert-char-for-test-result
-                                                       nil t))
-    (ewoc-invalidate ewoc node))
-  nil)
-
-(defun ert--button-action-position ()
-  "The buffer position where the last button action was triggered."
-  (cond ((integerp last-command-event)
-         (point))
-        ((eventp last-command-event)
-         (posn-point (event-start last-command-event)))
-        (t (assert nil))))
-
-(defun ert--results-progress-bar-button-action (button)
-  "Jump to details for the test represented by the character clicked in 
BUTTON."
-  (goto-char (ert--button-action-position))
-  (ert-results-jump-between-summary-and-result))
-
-(defun ert-results-rerun-all-tests ()
-  "Re-run all tests, using the same selector.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (assert (eql major-mode 'ert-results-mode))
-  (let ((selector (ert--stats-selector ert--results-stats)))
-    (ert-run-tests-interactively selector (buffer-name))))
-
-(defun ert-results-rerun-test-at-point ()
-  "Re-run the test at point.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (destructuring-bind (test redefinition-state)
-      (ert--results-test-at-point-allow-redefinition)
-    (when (null test)
-      (error "No test at point"))
-    (let* ((stats ert--results-stats)
-           (progress-message (format "Running %stest %S"
-                                     (ecase redefinition-state
-                                       ((nil) "")
-                                       (redefined "new definition of ")
-                                       (deleted "deleted "))
-                                     (ert-test-name test))))
-      ;; Need to save and restore point manually here: When point is on
-      ;; the first visible ewoc entry while the header is updated, point
-      ;; moves to the top of the buffer.  This is undesirable, and a
-      ;; simple `save-excursion' doesn't prevent it.
-      (let ((point (point)))
-        (unwind-protect
-            (unwind-protect
-                (progn
-                  (message "%s..." progress-message)
-                  (ert-run-or-rerun-test stats test
-                                         ert--results-listener))
-              (ert--results-update-stats-display ert--results-ewoc stats)
-              (message "%s...%s"
-                       progress-message
-                       (let ((result (ert-test-most-recent-result test)))
-                         (ert-string-for-test-result
-                          result (ert-test-result-expected-p test result)))))
-          (goto-char point))))))
-
-(defun ert-results-rerun-test-at-point-debugging-errors ()
-  "Re-run the test at point with `ert-debug-on-error' bound to t.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (let ((ert-debug-on-error t))
-    (ert-results-rerun-test-at-point)))
-
-(defun ert-results-pop-to-backtrace-for-test-at-point ()
-  "Display the backtrace for the test at point.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (let* ((test (ert--results-test-at-point-no-redefinition))
-         (stats ert--results-stats)
-         (pos (ert--stats-test-pos stats test))
-         (result (aref (ert--stats-test-results stats) pos)))
-    (etypecase result
-      (ert-test-passed (error "Test passed, no backtrace available"))
-      (ert-test-result-with-condition
-       (let ((backtrace (ert-test-result-with-condition-backtrace result))
-             (buffer (get-buffer-create "*ERT Backtrace*")))
-         (pop-to-buffer buffer)
-         (setq buffer-read-only t)
-         (let ((inhibit-read-only t))
-           (buffer-disable-undo)
-           (erase-buffer)
-           (ert-simple-view-mode)
-           ;; Use unibyte because `debugger-setup-buffer' also does so.
-           (set-buffer-multibyte nil)
-           (setq truncate-lines t)
-           (ert--print-backtrace backtrace)
-           (debugger-make-xrefs)
-           (goto-char (point-min))
-           (insert "Backtrace for test `")
-           (ert-insert-test-name-button (ert-test-name test))
-           (insert "':\n")))))))
-
-(defun ert-results-pop-to-messages-for-test-at-point ()
-  "Display the part of the *Messages* buffer generated during the test at 
point.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (let* ((test (ert--results-test-at-point-no-redefinition))
-         (stats ert--results-stats)
-         (pos (ert--stats-test-pos stats test))
-         (result (aref (ert--stats-test-results stats) pos)))
-    (let ((buffer (get-buffer-create "*ERT Messages*")))
-      (pop-to-buffer buffer)
-      (setq buffer-read-only t)
-      (let ((inhibit-read-only t))
-        (buffer-disable-undo)
-        (erase-buffer)
-        (ert-simple-view-mode)
-        (insert (ert-test-result-messages result))
-        (goto-char (point-min))
-        (insert "Messages for test `")
-        (ert-insert-test-name-button (ert-test-name test))
-        (insert "':\n")))))
-
-(defun ert-results-pop-to-should-forms-for-test-at-point ()
-  "Display the list of `should' forms executed during the test at point.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (let* ((test (ert--results-test-at-point-no-redefinition))
-         (stats ert--results-stats)
-         (pos (ert--stats-test-pos stats test))
-         (result (aref (ert--stats-test-results stats) pos)))
-    (let ((buffer (get-buffer-create "*ERT list of should forms*")))
-      (pop-to-buffer buffer)
-      (setq buffer-read-only t)
-      (let ((inhibit-read-only t))
-        (buffer-disable-undo)
-        (erase-buffer)
-        (ert-simple-view-mode)
-        (if (null (ert-test-result-should-forms result))
-            (insert "\n(No should forms during this test.)\n")
-          (loop for form-description in (ert-test-result-should-forms result)
-                for i from 1 do
-                (insert "\n")
-                (insert (format "%s: " i))
-                (let ((begin (point)))
-                  (ert--pp-with-indentation-and-newline form-description)
-                  (ert--make-xrefs-region begin (point)))))
-        (goto-char (point-min))
-        (insert "`should' forms executed during test `")
-        (ert-insert-test-name-button (ert-test-name test))
-        (insert "':\n")
-        (insert "\n")
-        (insert (concat "(Values are shallow copies and may have "
-                        "looked different during the test if they\n"
-                        "have been modified destructively.)\n"))
-        (forward-line 1)))))
-
-(defun ert-results-toggle-printer-limits-for-test-at-point ()
-  "Toggle how much of the condition to print for the test at point.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (let* ((ewoc ert--results-ewoc)
-         (node (ert--results-test-node-at-point))
-         (entry (ewoc-data node)))
-    (setf (ert--ewoc-entry-extended-printer-limits-p entry)
-          (not (ert--ewoc-entry-extended-printer-limits-p entry)))
-    (ewoc-invalidate ewoc node)))
-
-(defun ert-results-pop-to-timings ()
-  "Display test timings for the last run.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (let* ((stats ert--results-stats)
-         (start-times (ert--stats-test-start-times stats))
-         (end-times (ert--stats-test-end-times stats))
-         (buffer (get-buffer-create "*ERT timings*"))
-         (data (loop for test across (ert--stats-tests stats)
-                     for start-time across (ert--stats-test-start-times stats)
-                     for end-time across (ert--stats-test-end-times stats)
-                     collect (list test
-                                   (float-time (subtract-time end-time
-                                                              start-time))))))
-    (setq data (sort data (lambda (a b)
-                            (> (second a) (second b)))))
-    (pop-to-buffer buffer)
-    (setq buffer-read-only t)
-    (let ((inhibit-read-only t))
-      (buffer-disable-undo)
-      (erase-buffer)
-      (ert-simple-view-mode)
-      (if (null data)
-          (insert "(No data)\n")
-        (insert (format "%-3s  %8s %8s\n" "" "time" "cumul"))
-        (loop for (test time) in data
-              for cumul-time = time then (+ cumul-time time)
-              for i from 1 do
-              (let ((begin (point)))
-                (insert (format "%3s: %8.3f %8.3f " i time cumul-time))
-                (ert-insert-test-name-button (ert-test-name test))
-                (insert "\n"))))
-      (goto-char (point-min))
-      (insert "Tests by run time (seconds):\n\n")
-      (forward-line 1))))
-
-;;;###autoload
-(defun ert-describe-test (test-or-test-name)
-  "Display the documentation for TEST-OR-TEST-NAME (a symbol or ert-test)."
-  (interactive (list (ert-read-test-name-at-point "Describe test")))
-  (when (< emacs-major-version 24)
-    (error "Requires Emacs 24"))
-  (let (test-name
-        test-definition)
-    (etypecase test-or-test-name
-      (symbol (setq test-name test-or-test-name
-                    test-definition (ert-get-test test-or-test-name)))
-      (ert-test (setq test-name (ert-test-name test-or-test-name)
-                      test-definition test-or-test-name)))
-    (help-setup-xref (list #'ert-describe-test test-or-test-name)
-                     (called-interactively-p 'interactive))
-    (save-excursion
-      (with-help-window (help-buffer)
-        (with-current-buffer (help-buffer)
-          (insert (if test-name (format "%S" test-name) "<anonymous test>"))
-          (insert " is a test")
-          (let ((file-name (and test-name
-                                (symbol-file test-name 'ert-deftest))))
-            (when file-name
-              (insert " defined in `" (file-name-nondirectory file-name) "'")
-              (save-excursion
-                (re-search-backward "`\\([^`']+\\)'" nil t)
-                (help-xref-button 1 'help-function-def test-name file-name)))
-            (insert ".")
-            (fill-region-as-paragraph (point-min) (point))
-            (insert "\n\n")
-            (unless (and (ert-test-boundp test-name)
-                         (eql (ert-get-test test-name) test-definition))
-              (let ((begin (point)))
-                (insert "Note: This test has been redefined or deleted, "
-                        "this documentation refers to an old definition.")
-                (fill-region-as-paragraph begin (point)))
-              (insert "\n\n"))
-            (insert (or (ert-test-documentation test-definition)
-                        "It is not documented.")
-                    "\n")))))))
-
-(defun ert-results-describe-test-at-point ()
-  "Display the documentation of the test at point.
-
-To be used in the ERT results buffer."
-  (interactive)
-  (ert-describe-test (ert--results-test-at-point-no-redefinition)))
-
-
-;;; Actions on load/unload.
-
-(add-to-list 'find-function-regexp-alist '(ert-deftest . 
ert--find-test-regexp))
-(add-to-list 'minor-mode-alist '(ert--current-run-stats
-                                 (:eval
-                                  (ert--tests-running-mode-line-indicator))))
-(add-to-list 'emacs-lisp-mode-hook 'ert--activate-font-lock-keywords)
-
-(defun ert--unload-function ()
-  "Unload function to undo the side-effects of loading ert.el."
-  (ert--remove-from-list 'find-function-regexp-alist 'ert-deftest :key #'car)
-  (ert--remove-from-list 'minor-mode-alist 'ert--current-run-stats :key #'car)
-  (ert--remove-from-list 'emacs-lisp-mode-hook
-                         'ert--activate-font-lock-keywords)
-  nil)
-
-(defvar ert-unload-hook '())
-(add-hook 'ert-unload-hook 'ert--unload-function)
-
-
-(provide 'ert)
-
-;;; ert.el ends here



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