The problem seems to be due to

[056548283884d61b1b9637c3e56855ce3a17274d] Make cl-defstruct use
records.

I attach the result of git bisect as well as the script files I used to
reproduce.


-- 
Damien Cassou
http://damiencassou.seasidehosting.st

"Success is the ability to go from one failure to another without
losing enthusiasm." --Winston Churchill