Pip Cet wrote:

> (To reproduce the promised segfault, add
> 
> (defvar custom-dummy (make-hash-table :test 'eq))
> (puthash custom-dummy custom-dummy custom-dummy)
> 
> to custom.el, then rebuild and run (clrhash custom-dummy) in Emacs -Q.
> Trivial to fix, but apparently not obvious enough to have been caught
> in the original changes).

Thanks for reporting that. I installed the attached patch, which should fix that 
bug and clean up a few nearby glitches. This patch is a bit less trivial but 
should be a smidge faster than the trivial patch would have been.