bug#36447: 27.0.50; New "Unknown keyword" errors

[Stefan Monnier]

> The change is just the following?
>
> +  /* These structures may have been purecopied and shared
> +     (bug#36447).  */
> +  h->next = Fcopy_sequence (h->next);
> +  h->index = Fcopy_sequence (h->index);
> +  h->hash = Fcopy_sequence (h->hash);

Yes.  It may not be absolutely perfect, but it's simple enough and
should do the trick.


        Stefan