On Thu, 25 Aug 2011 19:12:20 +0200 Vegard Øye wrote: [...]
> But there are some issues that should be fixed, one of them being a > conflict between the backquote and the read syntax for > self-referential structures. For an example straight out of the Emacs > Lisp Reference Manual, you can write a list that has itself as the > second element like this: > > (setq x '#1=(a #1#)) > > Substitute the quote with a backquote, though, and Emacs signals > the error "Variable binding depth exceeds max-specpdl-size": > > (setq x `#1=(a #1#)) > > Then there's the case of self-referential lambda functions. If you > write the function below, how will it byte-compile? > > '#1=(lambda () #1#) I don't think there is anything surprising about either of your examples: both ``' and `lambda' are macros, so if you create a cycle, it expands and expands and expands and expands and expands... you get the idea. OTOH, if I understand correctly, Tim said that his Emacs crashed. No matter what you do in Elisp, Emacs should never crash, so that would definitely be a candidate for `report-emacs-bug'. -- Štěpán _______________________________________________ implementations-list mailing list [email protected] https://lists.ourproject.org/cgi-bin/mailman/listinfo/implementations-list
