[plt-scheme] R6RS

That's great news. Sooner than you announced. But on the other hand, I think 
PLT has had big influence on R6RS, and therefore it is not amazing you are 
coming with R6RS PLT so soon. :)
Jos

----- Original Message ----- 
From: "Matthew Flatt" <mflatt at cs.utah.edu>
To: <plt-scheme at list.cs.brown.edu>
Sent: Friday, March 07, 2008 1:10 PM
Subject: [plt-scheme] R6RS


> PLT Scheme v4.0 will support R6RS programs and libraries, and an
> "alpha" version of R6RS support is available now in pre-release builds
> and via SVN.
>
> See
>
>  http://docs.plt-scheme.org/r6rs/index.html
>
> for information on using the `plt-r6rs' executable or the `#!r6rs'
> module notation.
>
> We do not plan to add an "R6RS" language to DrScheme. Start an R6RS
> program or library with `#!r6rs', and then use DrScheme's "Module"
> language.
>
>
> Problems with this "alpha" version:
>
> 1. The test suite is incomplete --- little more than the examples in
>    R6RS, so far.
>
> 2. Syntax and run-time error message are poor in many cases.
>
> Also, although you can use R6RS libraries from `scheme/base' modules
> and vice-versa, R6RS pairs are mutable, which means that R6RS libraries
> and `scheme/base' have incompatible notions of pairs and lists. We
> expect that few R6RS libraries will need `(r6rs mutable-pairs)'
> library, directly or transitively, in which case they can be trivially
> translated to an "R6RS/i" variant of R6RS with immutable pairs --- and
> then interoperate smoothly with PLT Scheme code. We plan to implement
> this variant of R6RS and provide a way to translate and install a given
> set of R6RS libraries as R6RS/i libraries.
>
>
> Matthew
>
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