Racket v5.3.1

[Eli Barzilay]

[Gnus is playing tricks, hopefully this is not duplicated.]

Racket version 5.3.1 is now available from

http://racket-lang.org/

Racket:

* The `case' form dispatches on characters, fixnums, symbols, and
keywords in logarithmic time. (Thanks to Jon Zeppieri.)

* The new `racket/format' library provides new and improved
string-formatting functions.

* Logging tools include improved filtering support based on the name
of a logger. A new `define-logger' form simplifies the use of
named loggers. Forms such as `log-debug' now support string
formatting.

* The `for' forms now support `#:break' and `#:final' clauses.

* The new PLTCOMPILEDROOTS environment variable configures the
search path for compiled bytecode.


DrRacket:

* Check Syntax now summarizes the documentation (i.e., the blue
boxes) for the identifier at the insertion point in the top-right
corner of the definitions window.

* Check Syntax now runs continuously for programs that declare their
language within the source. This mode has been available for
several of the past releases, but now enabled by default.

* DrRacket can spell-check string constants (enable this in the Edit
menu).


Typed Racket:

* Typed Racket interprets the `Any' type as a different contract.
This may signal dynamic errors in some existing mixed
typed/untyped programs. The normal fix is to replace a use of
`Any' with a more specific types.

* NaN is included in all of Typed Racket's floating-point types,
which makes precise floating-point types easier to use.

* Typed Racket supports a `cast' operation with support for
higher-order types.

* Typed Racket provides the `:query-type/args' and
`:query-type/result' utilities to explore types at the REPL.


Miscellaneous:

* The `compatibility' collection provides features from Racket
relatives, such as `defmacro' and mutable lists. These features
are provided to ease porting code to Racket. Avoid them in modern
Racket code.

* Screenshots of the widgets provided by the Racket GUI library are
included in the documentation. (Thanks to Diogo F. S. Ramos.)

* FrTime was ported to racket `#lang'. (Thanks to Patrick Mahoney.)


Deprecation:

The following has been deprecated and will be removed in the January
2013 release:

* the `planet' command-line tool; use `raco planet' instead.

The following has been deprecated and will be removed in the August
2013 release:

* the `mzlib/class100' library; use `racket/class' instead.

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