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bug#39529: 28.0.50; Metahelp does not contain help text

From: Paul Eggert
Subject: bug#39529: 28.0.50; Metahelp does not contain help text
Date: Sat, 15 Feb 2020 15:25:44 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 2/9/20 11:34 AM, Eli Zaretskii wrote:

I suspect the sxhash changes on Jan 7.  This problem started happening
in that day's build.

Right you are. The problem was Emacs was using a hash table to unify identical Lisp compiled objects when purecopying them, even though their doc strings were not set up yet (and so were 0 placeholders that always compared equal). Formerly this bug was masked because sxhash simply returned the objects' hashed addresses, but the January 7 changes unveiled the bug. I install the attached patch to fix the problem.

Attachment: 0001-Fix-C-h-C-h-bug-due-to-mutating-a-hash-key.patch
Description: Text Data

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