From af905283bd0a89671a6b74881461f3ddcf2f35bc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20T=C3=A1vora?= <joaotavora@gmail.com>
Date: Wed, 6 Jan 2016 10:40:30 +0000
Subject: [PATCH] Fix debugging code for newer Emacsen

* yasnippet-debug.el (yas-debug-snippet-vars): Check for length of
`buffer-undo-list'. Don't assume all fields have integer
`yas--field-number'.
---
 yasnippet-debug.el | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/yasnippet-debug.el b/yasnippet-debug.el
index fe8816c..c5dd06a 100644
--- a/yasnippet-debug.el
+++ b/yasnippet-debug.el
@@ -45,7 +45,7 @@
                      (yas--snippet-id snippet)
                      (overlay-start (yas--snippet-control-overlay snippet))
                      (overlay-end (yas--snippet-control-overlay snippet))))
-      (princ (format "\tactive field: %d from %s to %s covering \"%s\"\n"
+      (princ (format "\tactive field: %s from %s to %s covering \"%s\"\n"
                      (yas--field-number (yas--snippet-active-field snippet))
                      (marker-position (yas--field-start (yas--snippet-active-field snippet)))
                      (marker-position (yas--field-end (yas--snippet-active-field snippet)))
@@ -55,7 +55,7 @@
                        (yas--exit-marker (yas--snippet-exit snippet))
                        (yas--exit-next (yas--snippet-exit snippet)))))
       (dolist (field (yas--snippet-fields snippet))
-        (princ (format "\tfield: %d from %s to %s covering \"%s\" next: %s%s\n"
+        (princ (format "\tfield: %s from %s to %s covering \"%s\" next: %s%s\n"
                        (yas--field-number field)
                        (marker-position (yas--field-start field))
                        (marker-position (yas--field-end field))
@@ -76,14 +76,15 @@
                    (point-max)))
     (unless (eq buffer-undo-list t)
       (princ (format "Undpolist has %s elements. First 10 elements follow:\n" (length buffer-undo-list)))
-      (let ((first-ten (subseq buffer-undo-list 0 19)))
+      (let ((first-ten (subseq buffer-undo-list 0 (min 19
+                                                       (length buffer-undo-list)))))
         (dolist (undo-elem first-ten)
           (princ (format "%2s:  %s\n" (position undo-elem first-ten) (truncate-string-to-width (format "%s" undo-elem) 70))))))))
 
 (defun yas--debug-format-fom-concise (fom)
   (when fom
     (cond ((yas--field-p fom)
-           (format "field %d from %d to %d"
+           (format "field %s from %d to %d"
                    (yas--field-number fom)
                    (marker-position (yas--field-start fom))
                    (marker-position (yas--field-end fom))))