Proposed patch for Bug#24627

[Tino Calancha <tino.calancha@gmail.com>]

Dear all,

if no further comments in ~1 week, then i will push following fix
into master branch.

Thank you.
Tino
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From 2539012f0e3966874b5645d440ec9e23b7b528b5 Mon Sep 17 00:00:00 2001
From: Tino Calancha <tino.calancha@gmail.com>
Date: Thu, 27 Oct 2016 18:18:45 +0900
Subject: [PATCH] (thing-at-point 'list) return nil if no list at point

* lisp/thingatpt.el (thing-at-point-bounds-of-list-at-point):
Check first if we are at the beginning of a top-level sexp (Bug#24627).
If point is inside a comment or string, look for a list out of the
comment/string.
Escape '[' in doc string.
* test/lisp/thingatpt-tests.el (thing-at-point-bug24627): Update
expected test result as pass.
---
  lisp/thingatpt.el            | 25 ++++++++++---------------
  test/lisp/thingatpt-tests.el |  1 -
  2 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/lisp/thingatpt.el b/lisp/thingatpt.el
index 6d1014b..e423630 100644
--- a/lisp/thingatpt.el
+++ b/lisp/thingatpt.el
@@ -219,22 +219,17 @@ 'beginning-of-sexp

  (defun thing-at-point-bounds-of-list-at-point ()
    "Return the bounds of the list at point.
-[Internal function used by `bounds-of-thing-at-point'.]"
+\[Internal function used by `bounds-of-thing-at-point'.]"
    (save-excursion
-    (let ((opoint (point))
-	  (beg (ignore-errors
-		 (up-list -1)
-		 (point))))
-      (ignore-errors
-	(if beg
-	    (progn (forward-sexp)
-		   (cons beg (point)))
-	  ;; Are we are at the beginning of a top-level sexp?
-	  (forward-sexp)
-	  (let ((end (point)))
-	    (backward-sexp)
-	    (if (>= opoint (point))
-		(cons opoint end))))))))
+    (let* ((st (parse-partial-sexp (point-min) (point)))
+           (beg (or (and (eq 4 (car (syntax-after (point))))
+                         (not (nth 8 st))
+                         (point))
+                    (nth 1 st))))
+      (when beg
+        (goto-char beg)
+        (forward-sexp)
+        (cons beg (point))))))

  ;; Defuns

diff --git a/test/lisp/thingatpt-tests.el b/test/lisp/thingatpt-tests.el
index 71d2c88..9d72db4 100644
--- a/test/lisp/thingatpt-tests.el
+++ b/test/lisp/thingatpt-tests.el
@@ -88,7 +88,6 @@ thing-at-point-test-data
  ;; `thing-at-point-bounds-of-list-at-point'.
  (ert-deftest thing-at-point-bug24627 ()
    "Test for http://debbugs.gnu.org/24627 ."
-  :expected-result :failed
    (let ((string-result '(("(a \"b\" c)" . (a "b" c))
                           (";(a \"b\" c)")
                           ("(a \"b\" c\n)" . (a "b" c))
-- 
2.9.3

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In GNU Emacs 26.0.50.8 (x86_64-pc-linux-gnu, GTK+ Version 3.22.1)
  of 2016-10-27
Repository revision: 0465bf511521ea780a61f1a0eb67731280e689a5