bug#55481: mostly nonrecursive printing [PATCH]

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Tue, 17 May 2022 15:59:16 +0200
> 
> Printing deeply nested values typically crashes Emacs by running out of C 
> stack since the printer uses C recursion to traverse nested data structures. 
> This is a long-standing problem that keeps turning up; see bug#52753 for one 
> example.
> 
> The attached patch eliminates most of the recursion: conses, vectors, 
> records, hash tables and char tables are now traversed without consuming C 
> stack. This should cover the vast majority of objects that form deep 
> structures.

Thanks, this is an important improvement, IMO.