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.