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Changes in Racket 5.1.3
This is a bugfix release, resolving the DrRacket issue with
the contour view. In addition, two tex files with problematic
licensing were removed.
Changes in Racket 5.1.2
* 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* The syntax-certificate system has been replaced by a syntax-taint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.)
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Changes in version 5.1.1, May 2011:
Enabled single-precision floats by default
Added single-flonum?
Changed eqv? so that inexacts are equivalent only when they
have the same precision
Changed file-or-directory-permission to add 'bits mode
and permission-setting mode
Added special treatment of void as an 'inferred-name property
Removed the "MrEd" compatability executable under Windows
and Mac OS X, but the "mred" compatibility script remains
racket/gui: added multi-column support to list-box%
racket/gui: added scrollbar support to panel%, vertical-panel%,
and horizontal-panel%
racket/gui: added 'wheel-left and 'wheel-right events
racket/file: add user-read-bit, etc.
racket/contract: removed some (undocumented) exports.
Changes in version 5.1, February 2011
Renamed "proxy" to "impersonator"
Added current-get-interaction-input-port, which enables
racket/gui events to be dispatched while a REPL is blocked
Changed equal? to equate C pointers when they refer to the
same address
Internal: weak boxes are cleared before non-will-like
finalizers; use late-weak boxes to get the old behavior
Changes in version 5.0.2, October 2010
Changed body of `when', `unless', `cond' clauses, `case'
clauses, and `match' clauses to be internal-definition contexts
Swapped unsafe-vector*-ref with unsafe-vector-ref, etc.
Added ->i to the contract library, improved ->*, adding #:pre and
#:post, as well as making the optional arguments clause optional.
Added #true and #false, and changed #t/#T and #f/#F to
require a delimiter afterward
Added print-boolean-long-form
Added read-accept-lang, which is set to #t when
reading a module
Added flonum?
Changed continuation-marks to accept a #f argument
to produce an empty set of marks
Added fxvectors
Added unsafe-{s,u}16-{ref,set!}
Added prop:proxy-of
Added proxies to go with chaperones, and renamed chaperone property
as proxy property; beware that the word "proxy" will change in
a future version, perhaps to "impersonator"
Added collection-file-path and collection splicing at the file
level
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Continuation barriers now block only downward continuation jumps
and allow escapes through full continuations
Changed internal-definition handling to allow expressions mixed
with definitions
Added support for subprocesses as new process groups
Added support for best-effort termination of subprocess by a
custodian
Added flreal-part, flimag-part, make-flrectangular, and unsafe
variants
Added fl->eact-integer, fl->fx, and unsafe-fl->fx
Added #:async-apply option to _fun
Added chaperone-evt
Added identifier-prune-to-source-module
Changed apply binding to enable lower-level optimizations
Upgraded to libffi 3.0.9+
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and racket{,-textual} each other.
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Import textual Racket version as lang/racket-textual.
Racket (formerly PLT Scheme) is a specific dialect of the Lisp
language based on the Scheme branch of the Lisp family.
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