bug#54501: Segfault on recursive structure

[Lars Ingebrigtsen]

Mattias Engdegård <mattiase@acm.org> writes:

> The patch fixes the #0=#0# nonsense as well since it's a trivial
> check.

Thanks; seems to work perfectly.

Do you think this is safe enough to go on the release branch?

This isn't a regression (Emacs has segfaulted on the #0=[#1=(#0# . #1#)]
as far back as I have Emacs versions), so I'd tend toward thinking it's
not vital enough to install on the release branch, but perhaps Eli has a
different opinion.  Eli?

> Admittedly it doesn't handle #1=#2=#1# -- please keep this bug
> open if you think it's important.

No, I think this fix is sufficient.

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