GNU bug report logs - #73431
Add `setf` support for `stream.el` in ELPA

Previous Next

Full log

Message #17 received at 73431 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Okamsn <okamsn <at> protonmail.com>
Cc: Philip Kaludercic <philipk <at> posteo.net>, Nicolas Petton <nicolas <at> petton.fr>,
 73431 <at> debbugs.gnu.org
Subject: Re: bug#73431: Add `setf` support for `stream.el` in ELPA
Date: Tue, 24 Sep 2024 22:56:14 -0400

> Currently, using `(setf (seq-elt STREAM 0) VAL)` silently fails, because 
> it treats the stream as a list, breaking the stream.

Sounds like a bug, indeed.  But I'd rather fix it by making it fail
cleanly, to preserve the (current) immutability of streams (at least
until we decide that there's a good reason for streams to be mutable).

> On the desire for mutability, there is the included macro `stream-pop`.

`stream-pop` does not mutate the stream.  It only mutates a local
variable (which holds a (reference to a) stream).


        Stefan

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.