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-rw-r--r--lisp/emacs-lisp/backtrace.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/backtrace.el b/lisp/emacs-lisp/backtrace.el
index e305822af1f..4f98bf3f4f5 100644
--- a/lisp/emacs-lisp/backtrace.el
+++ b/lisp/emacs-lisp/backtrace.el
@@ -58,7 +58,8 @@ Backtrace mode will attempt to abbreviate printing of backtrace
frames by setting `print-level' and `print-length' to make them
shorter than this, but success is not guaranteed. If set to nil
or zero, backtrace mode will not abbreviate the forms it prints."
- :type 'integer
+ :type '(choice natnum
+ (const :value nil :tag "Don't abbreviate"))
:group 'backtrace
:version "27.1")