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bug#25847: 26.0.50; Error completing help with nil entries in load-histo


From: Yuri D'Elia
Subject: bug#25847: 26.0.50; Error completing help with nil entries in load-history
Date: Thu, 23 Feb 2017 11:49:11 +0100
User-agent: mu4e 0.9.19; emacs 26.0.50

This is a regression in emacs 26. How to reproduce:

(defun test () "" nil) ;; insert text in buffer *scratch*
C-M-x ;; eval-defun (adds an entry to load-history with null file)
C-h f package- TAB ;; crashes

This is caused by `help--loaded-p' not handling nil entries, introduced
in 0c31ff43b6880c84498fbe1f06e1e5809b55e838.





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