[plt-scheme] r6rs (Possible) bug with zip?

As a reminder, we've requested help in sorting out the R6RS SRFI
support:

  http://list.cs.brown.edu/pipermail/plt-scheme/2009-January/029947.html

  http://list.cs.brown.edu/pipermail/plt-scheme/2009-March/031063.html

There have been no volunteers, so far.


At Sun, 20 Sep 2009 22:14:42 +0200, Thomas Chust wrote:
> 2009/9/20 LordGeoffrey <lordgeoffrey at optusnet.com.au>:
> > Compile message is:
> > null-list?: argument out of domain {1 2 3}
> > [...]
> 
> Hello,
> 
> that is apparently another instance of the problem that R6RS has
> mutable pairs / lists while everything based on the "standard" PLT
> Scheme dialects, including the SRFI implementations in the standard
> library, has immutable pairs / lists and that, in contrast to other
> datatypes, mutable pairs / lists are not a subtype of immutable ones.
> 
> In the case of SRFI-1 the problem could probably be remedied with
> relative ease by using the reference implementation compiled as R6RS
> code instead of the library that comes with PLT Scheme.
> 
> Ciao,
> Thomas