Re: Allow value of PRINT_CIRCLE to be modified from Elisp?

[Stefan Monnier]

> print.c defines an arbitrary fixed limit
>   #define PRINT_CIRCLE 200

> on the depth to which a lisp object can be printed, before it bails out
> with the "Apparently circular structure being printed" error.

> Apparently, no one anticipated wanting to print highly nested Elisp
> structures. But this arbitrary limit is breaking some of the
> functionality in Elisp packages I maintain (see below for a detailed
> explanation).

> Could the #define PRINT_CIRCLE constant be turned into a DEFVAR_INT
> `max-lisp-print-depth' variable, so that it could be adjusted from Elisp
> when more print depth is needed?

Maybe we should simply ignore PRINT_CIRCLE when `print-circle' is non-nil.


        Stefan