Racket v5.3.1

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.