<div>Well, I've used mutable pairs in the past to model graph structures, but it's already been pointed out that PLT Scheme offers an alternative, so I'm not worried about it.</div> <div> </div> <div>I've tried to argue that standards are extremeley important in certain areas, such as healthcare, and in government, so the R6RS discussion is hardldy moot. But I also think that immutable pairs represents a natural evolution and a significant technical advantatge. One point I frequently make in my day to day work that I think is especially pertinent here is that it is not the role of standards and standards bodies to create unnecessary work or discourage innovation. I was on a call yesterday where we came to the conclusion that a certain HITSP provision was essentially unimplementable and so we have been talking about going back to the standards body. Sometimes, that's just right.<br> <br></div> <div class="gmail_quote">On Wed, Nov 26, 2008 at 8:29 AM, Grant Rettke <span dir="ltr"><<a href="mailto:grettke@acm.org">grettke@acm.org</a>></span> wrote:<br> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"> <div class="Ih2E3d">On Wed, Nov 26, 2008 at 8:49 AM, Matthew Flatt <<a href="mailto:mflatt@cs.utah.edu">mflatt@cs.utah.edu</a>> wrote:<br>> So, to help gauge usefulness for this potential action, I'll revise the<br> > question:<br>><br>>  Does anyone actually use (and expect to continue to use) the `(rnrs<br>>  mutable-pairs)' library in PLT Scheme's R6RS?<br><br></div>Other than working on the TSPL homework, no, and, Jos' point would<br> address that use case.<br> <div> <div></div> <div class="Wj3C7c">_________________________________________________<br> For list-related administrative tasks:<br> <a href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme" target="_blank">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</a><br> </div></div></blockquote></div><br>