[racket] stream-cons from racket/stream isn't lazy

You should use SRFI-41, as SRFI-40 is deprecated.

On Sat, Mar 5, 2011 at 6:31 PM, Mark Engelberg <mark.engelberg at gmail.com>wrote:

> I've had some email discussions about this with the Racket team in the
> past, so here's a quick unofficial summary of what I've learned, while
> you're waiting for a more official response:
>
> racket/stream is not really a "stream library" by the typical Scheme
> definition of stream.  It's really a library to manipulate Racket's
> sequence abstraction with list-like functions.  The naming is
> misleading.  The whole library is experimental and is likely to change
> and you shouldn't really be using it anyway.
>
> Racket does not have a built-in stream library that integrates nicely
> with its sequence abstraction and uses the same naming scheme as its
> built-in list functions.  The srfis 40 and 41 will serve your most
> basic stream needs though (I think I've had better luck with srfi41).
>
> I get the impression that adding a complete, tightly-integrated stream
> library to Racket is of interest to the developers, but not a high
> priority because:
> a) There are tons of things competing for their development time, and
> something like a stream library is exactly the kind of thing that
> could be easily written by a motivated user.
> b) They believe that Lazy Racket can be used in many situations where
> you'd want to use streams.
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