Fwd: [racket] Racket v5.1.2

[Rodolfo Carvalho]

Nova versão lançada!

[]'s

Rodolfo Carvalho

---------- Forwarded message ----------
From: Eli Barzilay <e...@barzilay.org>
Date: Wed, Aug 3, 2011 at 16:36
Subject: [racket] Racket v5.1.2
To: us...@racket-lang.org


Racket version 5.1.2 is now available from

 http://racket-lang.org/

* The download page includes 64-bit installers for Mac OS X,
 Windows, and two Debian flavors.  Racket now supports OS X Lion.

* Racket now includes a new `racket/place' library to support
 parallelism, complementing `racket/future'.  Racket's parallel
 build process is now based on places instead of multiple OS
 processes.

 Places support share-nothing parallelism and message-passing
 communication.  Compared to futures, places are heavyweight, but
 they have a simpler performance model.

* The syntax-certificate system has been replaced by a syntax-taint
 system.  Both certificates and taints were designed to protect
 otherwise inaccessible bindings from abuse when they appear in
 macro expansions.  Taints are simpler and lighter, and the switch
 closes known holes in the certificate system.  Macros that are not
 implemented with `syntax-rules' or `define-syntax-rule', however,
 must explicitly use `syntax-protect' to protect their expansions
 from abuse.

* The `net/url' library supports HTTPS connections, but beware that
 by default all sites are accepted (equivalent to ignoring a
 browser's warnings about untrusted certificates).

* Error messages in the student languages use a simplified
 vocabulary and consistent phrasings.  If you maintain curriculum
 material or teachpacks then please consider updating.  See the
 "Error Message Composition Guidelines" section in the
 documentation for details.

* Typed Racket: almost all core Racket data structures and
 operations are now accessible in Typed Racket (most of this work
 is due to prolific contributor Eric Dobson).  The performance of
 the typechecker has been significantly improved.

* The `scriblib/bibtex' library supports BibTeX-formatted citation
 databases in Scribble documents.  BibTeX can be tricky to parse,
 so please report failed entries as bug reports.

* The `for' forms now support an `#:unless' clause, and a
 nonnegative integer can be used as a sequence.  The new `compose1'
 function creates single-valued composition functions.  The
 `racket/function' library now provides `identity', `thunk', and
 `thunk*'.

* The license has been clarified: we now use LGPLv2.1 uniformly.
 (The license file used to specify LGPLv2, contrary to the download
 pages.)

[Note that mirror sites can take a while to catch up with the new
downloads.]

Feedback Welcome,
--
         ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                   http://barzilay.org/                   Maze is Life!
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