diff --git a/pkgs/plt-services/meta/announcements/README.txt b/pkgs/plt-services/meta/announcements/README.txt
deleted file mode 100644
index 2d1f2af4a6..0000000000
--- a/pkgs/plt-services/meta/announcements/README.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-The format of each release-anouncement file is the release date in
-seconds (like the result of `(current-seconds)`), any amount of
-whitespace, and the the release announcement.
diff --git a/pkgs/plt-services/meta/announcements/v5.0.1.txt b/pkgs/plt-services/meta/announcements/v5.0.1.txt
deleted file mode 100644
index a6388a3e5a..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.0.1.txt
+++ /dev/null
@@ -1,64 +0,0 @@
-1280887792
-Racket v5.0.1
-
-* Datalog is a lightweight deductive database system with Racket
-  integration.  It is now available in the `datalog' collection and
-  with `#lang datalog'.
-
-* Racklog provides Prolog-style logic programming in Racket, adapted
-  from Dorai Sitaram's Schelog package.  It is available in the
-  `racklog' collection and now as `#lang racklog'.
-
-* By default `make install' and `raco setup' compile collections in
-  parallel on all available processors.  (Use `raco setup -j 1' to
-  disable, if necessary.)
-
-* Changes (as part of 5.0) in the `racket' language compared to the
-  `scheme' language: constructor-style printing, a `struct'
-  alternative to `define-struct' that fits more naturally with
-  `match' and constructor-style printing, bytecode-dependency
-  management via SHA-1 hashes instead of just timestamps (where the
-  `openssl/sha1' library provides the SHA-1 hash function), a
-  reorganization of `scheme/foreign' into `ffi/unsafe' and
-  associated libraries, and new printing functions `eprintf' and
-  `displayln'.  Also, a generator from `racket/generator' is
-  required to have the form `(generator () body ...)', which
-  supports a planned extension to let a generator accept arguments.
-
-* Changes to the `racket' language (since 5.0): internal-definition
-  positions allow mixing expressions with definitions, full
-  continuations can escape past a continuation barrier, custodians
-  can attempt to terminate subprocesses and subprocess groups (see
-  `current-subprocess-custodian-mode', `subprocess-group-enabled'),
-  the JIT supports additional unboxing flonum operations and unsafe
-  variants, `ffi/unsafe' provides an asychronous-call mechanism to
-  deal with foreign threads, a new "." modifier for format string
-  directives (e.g., "~.s" and "~.a") limits the respective output to
-  `(error-print-width)' characters.
-
-* The core type system of Typed Racket has been substantially
-  revised.  In particular, Typed Racket can now follow significantly
-  more sophisticated reasoning about the relationships between
-  predicates.  Additionally, Typed Racket now allows variable arity
-  types in more places, allowing programmers to specify
-  variable-arity lists.
-
-* We are working on an optimizing version of Typed Racket that takes
-  advantage of type information for certain classes of programs.
-  This project is a work in progress.  For those interested, see the
-  documentation for `#:optimized'.
-
-* The `web-server/formlets' library adds a `formlet*' form that
-  allows dynamic formlet construction, as opposed to `formlet' which
-  requires syntactic Xexprs and static formlets.  Several new
-  library formlets are added.
-
-* The `syntax/parse' library has new support for matching literals
-  at different phases using the `#:phase' argument for literals and
-  literal sets.
-
-* RackUnit now includes a GUI test runner as `rackunit/gui'.
-
-* The `2htdp/image' library now includes `flip-vertical' and
-  `flip-horizontal' operations that mirror images (vertically and
-  horizontally).
diff --git a/pkgs/plt-services/meta/announcements/v5.0.2.txt b/pkgs/plt-services/meta/announcements/v5.0.2.txt
deleted file mode 100644
index adadca1c3c..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.0.2.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-1289106828
-Racket v5.0.2
-
-* Typed Racket's optimizer is now turned on by default; error
-  messages have been simplified and clarified.
-
-* Contracts: contracts on mutable containers allow functions or
-  other higher order values, and contracts are checked when updating
-  or dereferencing the containers.  The new contracts are slower
-  than the old ones, so the old check-once functionality is still
-  available.
-
-  A new dependent function contract combinator, `->i', properly
-  assigns blame for contracts that violate themselves and the
-  generated wrappers are more efficient than `->d'.  (Although it
-  does more checking so your contracts may be faster or slower).
-
-  See the docs for `box/c', `hash/c', `vector/c', `vectorof' and
-  `->i' for more details.
-
-* The `when', `unless', `cond', `case', and `match' forms (in
-  `racket/base' and derived languages) now allow immediate internal
-  definitions.
-
-* Web server: the formlets library provides more HTML form elements;
-  `make-xexpr-response' supports a preamble for DTD declarations;
-  `serve/servlet' supports stateless servlets.
-
-* New WebSocket implementation, see `net/websocket' for details.
-
-* The new `data' collection contains implementations of several data
-  structures, including growable vectors and order-based
-  dictionaries.
-
-* `racket/match' is now significantly faster
-
-* The Racket documentations are built in parallel by default.
-
-* The stepper is now compatible with programs using the Universe
-  teachpack.
-
-* `2htdp/image': pinholes are now supported in the library (if you
-  don't use pinhole primitives you will not see them); a number of
-  new triangle functions added; supports conversion of images to
-  color lists and back.  Also, cropping has been improved for
-  scenes; see the documentation section on the nitty-gritty of
-  pixels for details.
-
-* Signatures have been moved to ASL, BSL, BSL+, ISL, and ISL+ (HtDP
-  teaching languages) no longer support checked signatures.
-
-* Student languages: one-armed `check-error' in all levels; ASL is
-  extended with hash operations, and `define-datatype'.
-
-* DMdA languages: Checking for parametric signatures is now eager.
-  This catches errors earlier, but retains the asymptotic complexity
-  properties; signatures for record types now have generators;
-  `list-of' and `any' signatures are now provided.
diff --git a/pkgs/plt-services/meta/announcements/v5.0.txt b/pkgs/plt-services/meta/announcements/v5.0.txt
deleted file mode 100644
index 93a47ec109..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.0.txt
+++ /dev/null
@@ -1,36 +0,0 @@
-1275916233
-PLT is happy to announce the release of Racket, available from
-
-  http://racket-lang.org/
-
-With Racket, you can script command shells and web servers; you can
-quickly prototype animations and complex GUIs; regexps and threads are
-here to serve you.  To organize your systems, you can mix and match
-classes, modules or components.  Best of all, you start without writing
-down types.  If you later wish to turn your script into a program, equip
-your Racket modules with explicit type declarations as you wish.  And
-Racket doesn't just come as a typed variant; you can also write your
-modules in a purely functional and lazy dialect.
-
-Racket comes in so many flavors because Racket is much more than a
-standard scripting language or a plain programming language.  Racket
-supports language extensibility to an unequaled degree.  A Racket
-programmer knows that making up a new language is as easy as writing a
-new library.
-
-To help you start quickly, Racket includes batteries in all shapes and
-sizes, most importantly, extensive documentation and all kinds of
-libraries.
-
-Racket occupies a unique position between research and practice.  It
-inherits many major ideas from language research, among them type safety
-(when the type system says that x is a number, then at runtime it always
-is a number) and memory safety (when some memory is reclaimed by the
-garbage collector it is impossible to still have a reference to it).  At
-the same time, user demand governs rigid adherence to purely theoretical
-principles.
-
-Racket, formerly PLT Scheme, is a product of over 15 years of
-development.  Although Racket starts with a mature software base and an
-established user community, its new name reflects our view that this is
-just the beginning of Racket's evolution.
diff --git a/pkgs/plt-services/meta/announcements/v5.1.1.txt b/pkgs/plt-services/meta/announcements/v5.1.1.txt
deleted file mode 100644
index f8d51db966..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.1.1.txt
+++ /dev/null
@@ -1,64 +0,0 @@
-1304146952
-Racket v5.1.1
-
-* The new `racket/stream' library provides `stream-first',
-  `stream-rest', a lazy `stream-cons', and so on.  Streams are a
-  subtype of sequences, so they work in `for' forms.  Some sequence
-  generators, such as `in-range', now produce streams.  A
-  `racket/sequence' library replaces the old `racket/stream'
-  library.
-
-* The new `racket/syntax' library contains facilities useful for
-  writing macros.  The new `syntax/srcloc' and `syntax/location'
-  libraries provide support for manipulating source locations.
-
-* The `racket/gui' library now supports multi-column list boxes and
-  scrolling panels.
-
-* The new `ffi/file' library is useful for writing foreign library
-  bindings that cooperate with Racket's security guard mechanism.
-
-* Generators from the `racket/generator' library can now have formal
-  arguments that are used when the generator is fired up.
-
-* Single-precision floating-point support is now enabled by default.
-  Single-precision floats print differently from their default
-  double-precision counterparts, new primitives convert between the
-  two precisions, and new reader syntax supports single-precision
-  literals.
-
-* JIT improvements include a small change to aid x86 branch
-  prediction on function-call returns, which can speed up some
-  programs significantly.
-
-* Typed Racket:
-  - The numeric tower has been entirely overhauled.  TR programs can
-    now use more precise types than before, and check more numeric
-    properties, such as sign or range properties.
-  - Fixnum optimizations have been improved and should apply more
-    broadly.
-  - The performance of the typechecker has been improved.  In
-    particular, dispatch on large union types should typecheck much
-    faster than before.
-
-* The Stepper can now step through Lazy Racket programs.
-
-* The `racket/future' library includes `fsemaphore' values, the
-  `future' primitive no longer freezes futures (so a future can
-  spawn new futures), and `future' log messages are more
-  informative.
-
-* PLaneT development links are now version-specific.
-
-* The `2htdp/image' library now includes `overlay/align',
-  `underlay/align', `overlay/align/offset' and
-  `underlay/align/offset'.
-
-* The network protocol for universes in `2htdp/universe' has
-  changed, so that v5.1.1 is incompatible with earlier versions.
-
-* The "DrScheme" application (which simply ran DrRacket in the last
-  few releases) has been removed.  The "MrEd" GUI executables for
-  Windows and Mac OS X have also been removed, although the "mred"
-  console executable remains for Unix and Mac OS X to support old
-  scripts.
diff --git a/pkgs/plt-services/meta/announcements/v5.1.2.txt b/pkgs/plt-services/meta/announcements/v5.1.2.txt
deleted file mode 100644
index 61f27ef46c..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.1.2.txt
+++ /dev/null
@@ -1,52 +0,0 @@
-1312399420
-Racket v5.1.2
-
-* 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.)
diff --git a/pkgs/plt-services/meta/announcements/v5.1.3.txt b/pkgs/plt-services/meta/announcements/v5.1.3.txt
deleted file mode 100644
index dc64ab3320..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.1.3.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-1313480645
-Racket v5.1.3
-
-This is a bugfix release, resolving the DrRacket issue with the contour
-view.  In addition, two tex files with problematic licensing were
-removed.
diff --git a/pkgs/plt-services/meta/announcements/v5.1.txt b/pkgs/plt-services/meta/announcements/v5.1.txt
deleted file mode 100644
index d404b9ca3e..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.1.txt
+++ /dev/null
@@ -1,79 +0,0 @@
-1297739878
-Racket v5.1
-
-The most significant change in version 5.1 is a rewrite of the GUI
-library:
-
-  http://blog.racket-lang.org/2010/12/racket-version-5.html
-
-Unix/X users will see the biggest difference with this change,
-because DrRacket and all Racket GUI programs now take on the desktop
-theme for menus, buttons, and other GUI widgets.
-
-In the long run, Racket GUI programs on all platforms will improve
-as a result of the library rewrite.  In the short run, beware that
-this first release of a new library will inevitably include a new
-set of bugs.
-
-Version 5.1 changes in more detail:
-
-* The `racket/draw' library -- which implements the drawing half the
-  GUI toolkit -- can be used independent of the `racket/gui/base'
-  library and without a graphics display (e.g., without an X11
-  connection).
-
-  The new library has one small incompatibility with the old GUI
-  toolbox: 'xor drawing is no longer supported.  The new library has
-  many additional features: rotation and general affine
-  transformations, PDF and SVG drawing contexts, gradients, and
-  alpha-channel bitmaps.
-
-* The GRacket executable is no longer strictly necessary for running
-  GUI programs, because the `racket/gui/base' library can be used
-  from Racket.  To the degree that a platform distinguishes GUI and
-  console applications, however, the GRacket executable still offers
-  some additional GUI-specific functionality (e.g., single-instance
-  support).
-
-  The new `racket/gui/base' library includes small incompatibilities
-  with the old GUI toolbox: the `send-event',
-  `current-ps-afm-file-paths', and `current-ps-cmap-file-paths'
-  functions have been removed.  The `racket/gui/base' library
-  re-exports `racket/draw', so it includes the same drawing
-  functionality as before (except for 'xor drawing).
-
-* The new `racket/snip' library can be used independently of
-  `racket/gui/base' to work with graphical editor content (e.g.,
-  images in student programs).  Like `racket/draw', the
-  `racket/snip' library is re-exported by `racket/gui/base'.
-
-* The Web Server includes a backwards incompatible change that
-  prevents X-expressions and lists of bytes from being directly
-  returned from servlets.  This change will increase performance for
-  those types of responses and allow easier experimentation with
-  response types.  Please see "collects/web-server/compat/0/README"
-  in the installation to learn about porting your servlets forward.
-  Don't worry.  It's easy.
-
-* The new `raco demodularize' tool collapses a module's dependencies
-  into a single module comprising the whole program.  This
-  transformation currently provides no performance improvement, but
-  is the basis for cross-module optimization and dead-code
-  elimination tools to come.  The transformation is currently useful
-  for static analysis of whole Racket programs.
-
-* The picturing-programs teachpack, formerly installed via PLaneT,
-  is now bundled with the standard distribution.  Use the teachpack
-  with `(require picturing-programs)' instead of `(require
-  installed-teachpacks/picturing-programs)'.  The old PLaneT-based
-  installation procedure still works, but it now merely installs a
-  stub that invokes the bundled version.
-
-* Slideshow picts, `racket/draw' bitmaps, and images created with
-  `2htdp/image' can now be used directly in Scribble documents.
-  More generally, the new `file/convertible' protocol enables any
-  value that is convertible to a PNG and/or PDF stream to be used as
-  an image in a Scribble document.
-
-* The Same game sports a new look and an improved scoring system.
-  (The current known high score is 12,429; can you beat that?)
diff --git a/pkgs/plt-services/meta/announcements/v5.2.1.txt b/pkgs/plt-services/meta/announcements/v5.2.1.txt
deleted file mode 100644
index 6fa18f2a3b..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.2.1.txt
+++ /dev/null
@@ -1,48 +0,0 @@
-1332774630
-Racket v5.2.1
-
-* Performance improvements include the use of epoll()/kqueue() instead
-  of select() for the Racket thread scheduler, cross-module inlining of
-  small functions, and the use of SSE instead of x87 for JIT-compiled
-  floating-point operations on platforms where SSE is always available
-  (including x86_64 platforms).  A related change is the interning of
-  literal numbers, strings, byte strings, characters, and regexps that
-  appear in code and syntax objects.
-
-* DrRacket uses a set of composable ray-traced icons available from the
-  new `images' library collection.
-
-* Typed Racket's `typecheck-fail' form allows macro creators to
-  customize the error messages that Typed Racket produces.  This is
-  especially useful when creating pattern matching macros.
-
-* The performance of Redex's matcher has been substantially improved;
-  depending on the model you should see improvements between 2x and 50x
-  in the time it takes to reduce terms.
-
-* Plots look nicer and are more correct at very small and very large
-  scales.  New features include customizable dual axis ticks and
-  transforms (e.g., log axes, date and currency ticks, axis interval
-  collapse and stretch), stacked histograms, and 3D vector fields.  The
-  legacy `fit' function and libfit have been removed.
-
-* The `2htdp/universe' library's `big-bang' form supports an
-  experimental game pad key handler.
-
-* The `db' library now supports nested transactions and PostgreSQL
-  arrays.  Bugs involving MySQL authentication and memory corruption in
-  the SQLite bindings have been fixed.
-
-* The Macro Stepper tool in DrRacket no longer executes a program after
-  expanding it.
-
-* In the DMdA teaching languages, infinite recursive signatures
-  ("streams", for example) with no intervening `mixed' are now
-  supported, and the signatures of record definitions without fields now
-  have generators for use with `property'.
-
-* MysterX's ActiveX support is deprecated and will be removed in the
-  next release.  MysterX's core COM functionality will become deprecated
-  in the next release, but COM functionality will be supported for the
-  foreseeable future as a compatibility layer over a forthcoming
-  `ffi/com' library.
diff --git a/pkgs/plt-services/meta/announcements/v5.2.txt b/pkgs/plt-services/meta/announcements/v5.2.txt
deleted file mode 100644
index 53b4ce664a..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.2.txt
+++ /dev/null
@@ -1,132 +0,0 @@
-1320893942
-Racket v5.2
-
-Release Highlights:
-
-* DrRacket comes with an experimental, on-line check syntax tool,
-  although this new tool is disabled default.  See below for more
-  information.
-
-* The new `db' library offers a high-level, functional interface to
-  popular relational database systems, including PostgreSQL, MySQL,
-  and SQLite, as well as other systems via ODBC.
-
-* A new XREPL collection provides convenient commands for a plain
-  racket REPL.  It is particularly convenient for people who prefer
-  console-based work and alternative editors.  See also the new
-  chapter on command-line tools and other editors at the end of the
-  Racket Guide.
-
-* The `plot' collection has been reimplemented in Racket.  It now
-  offers PDF output, log axes, histograms, and more.  Some code that
-  uses `plot' will still work, and some will need light porting.
-  The `plot/compat' module offers expedient backward compatibility.
-
-* DrRacket uses more conventional key bindings: `C-t' creates a new
-  tab, `C-w' closes the current one, and `C-r' runs the definitions.
-  On Mac OS X, the Command key is used.  See "Defining Custom
-  Shortcuts" in the DrRacket manual for an example that uses the old
-  key bindings.
-
-* The new `raco link' command registers a directory as a collection,
-  which allows the collection directory to reside outside the
-  "collects" tree and without changing the PLTCOLLECTS environment
-  variable.
-
-* Typed Racket:
-  - Typed Racket provides static performance debugging support to
-    show which code gets optimized and point out code that does not.
-    Use the "Performance Report" button in DrRacket.
-  - More intuitive types in printouts in the REPL and in error
-    messages.  Use `:query-result-type' to explore types, or
-    `:print-type' for a full printout.
-  - Typed Racket now supports defining function with optional
-    arguments using the same syntax as Racket.
-
-* Redex now supports specifying (and testing and automatically
-  typesetting) judgment forms including type systems and SOS-style
-  operational semantics.
-
-* Fixed several GUI problems, including problems on Ubuntu 11.10
-  (GTK+ 3) and 64-bit Mac OS X.
-
-* Internal-definition expansion has changed to use `let*' semantics
-  for sequences that contain no back references.  This change
-  removes a performance penalty for using internal definitions
-  instead of `let' in common cases, and it only changes the meaning
-  of programs that capture continuations in internal definitions.
-  Internal definitions are now considered preferable in style to
-  `let'.
-
-* Support for `begin-for-syntax' has been generalized; modules may
-  now define and export both value bindings and syntax bindings
-  (macros) at phase 1 and higher.
-
-  Due to a bug, phase 1 syntax (or higher) is not available in
-  DrRacket's `#lang'-based REPL.  A simple workaround is to disable
-  debugging in DrRacket (see "no debugging" radio button in detailed
-  language dialog).
-
-Additional Items:
-
-* The `racket/gui' library (and Slideshow) provides more support for
-  multiple-screen displays.
-
-* DrRacket remembers whether an opened file used LF or CRLF line
-  endings, and will continue using the same.  When creating a new
-  file, a preference determines how it is saved.
-
-* `net/url' can now follow HTTP redirections.
-
-* The LNCS and JFP class files are no longer distributed with
-  Racket.  Instead, they are downloaded on demand.
-
-* The Algol language implementation is now available as a plain
-  language using `#lang algol60'.
-
-* The Racket-to-C compiler (as accessed via `raco ctool' or `mzc')
-  has been removed; Racket's JIT has long provided better
-  performance, and the FFI provides better access to C libraries.
-
-* Contracts can be applied to exports with the new `contract-out'
-  form within `provide', instead of a separate `provide/contract'
-  form.  (The new `contract-out' form is implemented as a new kind
-  of "provide pre-transformer".)
-
-* The `date*' structure type is an extension of `date' with
-  `nanosecond' and `time-zone-name' fields.
-
-* New looping constructs: `for/sum' and `for/product'.
-
-* Direct calls to keyword-accepting functions are now optimized to
-  eliminate the overhead of keywords.  In addition, the compiler
-  detects and logs warnings for keyword-argument mismatches.
-
-* The libfit interface is available from `plot/deprecated/fit', and
-  will be removed in the near future.
-
-* The Unix installer has been re-done, and it is now more robust.
-
-* The built-in reader and printer support for Honu is removed.
-  (This functionality is re-implemented in Racket.)
-
-On-line Check Syntax:
-
-DrRacket now provides an on-line version of the syntax check tool,
-which means that syntax checking runs automatically while you
-continue to edit a program.  With this tool enabled, its annotations
-(e.g., binding arrows) and actions (e.g., the renaming refactoring
-and direct documentation links) are almost always available.
-
-We have noticed that on-line syntax checking renders DrRacket
-unstable on occasion, perhaps because it relies on relatively new
-support for parallelism.  Occurrences of the problem are rare, but
-they are not rare enough, which is why we have disabled the tool by
-default.  At the same time, current users of the tool find it so
-valuable that we felt it should be included in the release.  We
-expect to track down the remaining problems and enable the tool by
-default in near-future release.
-
-To enable on-line syntax checking (for `#lang'-based programs only),
-click on the red dot in the bottom right of DrRacket's window.  To
-turn it off, click there again.
diff --git a/pkgs/plt-services/meta/announcements/v5.3.1.txt b/pkgs/plt-services/meta/announcements/v5.3.1.txt
deleted file mode 100644
index 52520e3d42..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.3.1.txt
+++ /dev/null
@@ -1,73 +0,0 @@
-1352317841
-Racket v5.3.1
-
-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.
diff --git a/pkgs/plt-services/meta/announcements/v5.3.2.txt b/pkgs/plt-services/meta/announcements/v5.3.2.txt
deleted file mode 100644
index 392aa4d23f..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.3.2.txt
+++ /dev/null
@@ -1,88 +0,0 @@
-1359691127
-Racket v5.3.2
-
-Core Libraries:
-
-* The new `math' library provides functions and data structures for
-  working with numbers and collections of numbers.  Functions include
-  non-elementary (such as gamma, zeta, Lambert's W), number-theoretic
-  (factorization, modular arithmetic), linear algebra (arithmetic,
-  decompositions), and statistical (expected values, order statistics,
-  binning).  Data structures include arbitrary-precision bigfloats,
-  probability distributions, and multidimensional arrays.
-
-* The new `file/untar', `file/untgz', and `file/unzip' libraries support
-  unpacking widely used archive formats.
-
-* The new `lazy-require' form allows programs to delay the loading and
-  instantiation of helper modules until they are needed.
-
-* The new `data/bit-vector' library provides an implementation of bit
-  vectors (a mutable sequence of booleans) supporting popcount.
-
-* The `racket/generic' library allows the specification of default
-  method implementations for core datatypes.
-
-* The `openssl' library can verify hostnames and use the operating
-  system's certificate store to verify certificates.
-
-Package System:
-
-* A new package system is in beta release.  This system will become
-  Planet's successor.  It differs significantly from the latter.  For
-  details, please read the documentation at
-  http://docs.racket-lang.org/planet2/ and list your packages on the new
-  index at https://pkg.racket-lang.org/.
-
-* The `raco test' command supports testing by collection and package, in
-  addition to by directory and file, with the "-c" and "-p" options.
-
-Teaching Libraries:
-
-* batch-io: the read and write functions work on Unix-style standard
-  input and output.
-
-DrRacket:
-
-* DrRacket's GUI is more responsive.
-
-* The automatic parenthesis insertion mode is improved.
-
-Scribble:
-
-* Scribble renders Markdown format files via the "--markdown"
-  command-line flag.  Example use case: Generate documentation hosted on
-  GitHub or BitBucket.
-
-* Documentation cross-reference information is stored in an SQLite3
-  database, which means that SQLite3 is required for building Racket
-  documentation on Unix/Linux machines (but SQLite3 is included in
-  Racket distributions for Windows and Mac OS X).
-
-  Using a database for cross-reference information significantly reduces
-  the initial footprint of DrRacket, since DrRacket no longer needs to
-  load all cross-reference information.
-
-Typed Racket:
-
-* Typed Racket programs can require `plot/typed' to draw plots.  List-
-  and vector-accepting functions accept general sequences.
-
-* Typed Racket supports Racket's delimited continuation and continuation
-  mark operators.
-
-Redex:
-
-* Added more support for `define-judgment-form', including random
-  generation for well-formed judgments and visualization of judgments.
-
-Deprecation:
-
-The following have been removed in this 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.
diff --git a/pkgs/plt-services/meta/announcements/v5.3.3.txt b/pkgs/plt-services/meta/announcements/v5.3.3.txt
deleted file mode 100644
index 0e09c762e3..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.3.3.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-1360960689
-Racket v5.3.3
-
-This is a bug-fix release to address a flaw in DrRacket v5.3.2
-concerning interactions between the contour window and the syntax
-coloring.
diff --git a/pkgs/plt-services/meta/announcements/v5.3.4.txt b/pkgs/plt-services/meta/announcements/v5.3.4.txt
deleted file mode 100644
index 747a0e3b7a..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.3.4.txt
+++ /dev/null
@@ -1,22 +0,0 @@
-1368030118
-Racket v5.3.4
-
-* Extflonums (80-bit floating-point numbers) are supported on some
-  x86/x86_64 platforms -- including Windows, and including platforms
-  where Racket is compiled to use SSE instructions for flonum
-  arithmetic.  Thanks to Michael Filonenko.
-
-* OS X: DrRacket and all of the other apps are now signed with an
-  official key.
-
-* Tally Maze: a new game based an enumeration of 2d mazes.
-
-* The Optimization Coach, a DrRacket plugin, has been moved from the
-  Racket distribution to the Racket package repository.  Install it
-  with: raco pkg install optimization-coach
-
-* Redex: `define-union-language' now merges productions when
-  languages define the same nonterminals.  Thanks to William Bowman.
-
-* The `srfi/19' library is now compatible with the date structure
-  type exported by `racket/base'.
diff --git a/pkgs/plt-services/meta/announcements/v5.3.5.txt b/pkgs/plt-services/meta/announcements/v5.3.5.txt
deleted file mode 100644
index 1e597ef0bd..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.3.5.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-1371553231
-Racket v5.3.5
-
-This is a special-purpose release to match the arrival of "Realm of
-Racket" in bookstores.  Racket v.5.3.5 adds a single `realm'
-collection to the v5.3.4 release.  The new collection contains the
-source code that readers of Realm may wish to use for experiments.
diff --git a/pkgs/plt-services/meta/announcements/v5.3.6.txt b/pkgs/plt-services/meta/announcements/v5.3.6.txt
deleted file mode 100644
index b4c6162ef5..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.3.6.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-1376138835
-Racket v5.3.6
-
-Racket v5.3.6 is a bug-fix release.  It eliminates errors from v5.3.5
-that people have found over the summer.
diff --git a/pkgs/plt-services/meta/announcements/v5.3.txt b/pkgs/plt-services/meta/announcements/v5.3.txt
deleted file mode 100644
index d8de976b57..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.3.txt
+++ /dev/null
@@ -1,82 +0,0 @@
-1344312796
-Racket v5.3
-
-* Submodules are nested module declarations that can be loaded and
-  run independently from the enclosing module.  For an overview of
-  submodules, see
-
-    http://blog.racket-lang.org/2012/06/submodules.html
-
-* The futures visualizer is a graphical profiling tool for parallel
-  programs using futures.  The tool shows a detailed execution
-  timeline depicting the migration of futures between threads, and
-  gives detailed information about each runtime synchronization that
-  occurred during program execution.  In addition, `would-be-future'
-  is a special type of future that always executes sequentially and
-  records all potential barricades a regular future would encounter.
-
-* Optimization Coach (formerly Performance Report) reports
-  information about Racket's inlining optimizations.  Optimization
-  Coach can be launched in any language through the View menu.
-
-* The new `images/flomap' library defines floating-point bitmaps and
-  fast image processing operations on them.  It is written in Typed
-  Racket, so Typed Racket code may use it without the cost of
-  contract checks.
-
-* The new `json' library supports parsing and generating JSON.
-  (Originally based on Dave Herman's planet library.)
-
-* `racket/string' is extended with a set of simplified string
-  manipulation functions that are more convenient than using
-  regexps.  `regexp-match*' and friends can now be used with new
-  keyword arguments to return specific matched regexp group/s and
-  gaps between matches.
-
-* The new `racket/generic' library allows generic function
-  definitions, which dispatch to methods added to a structure type
-  via the new `#:methods' keyword.
-
-* The `class' form supports declaring a method abstract.  An
-  abstract method prevents a class from being instantiated unless it
-  is overridden.
-
-* The contract library comes with support for interfaces, generics,
-  prompts, continuation-marks, and structs.
-
-* Most error messages use a new multi-line format that is more
-  consistent with contract errors and accommodates more information.
-
-* Typed Racket supports function definitions with keyword arguments;
-  the startup time of Typed Racket programs has been sharply
-  reduced.
-
-* The new `ffi/com' library replaces MysterX; a compatibility
-  `mysterx' library remains, but without ActiveX support.  The new
-  `ffi/unsafe/com' library offers a more primitive and direct way to
-  use COM classes and methods.
-
-* There is now a very complete completion code for zsh.  It is not
-  included in the distribution though; get it at http://goo.gl/DU8JK
-  (This script and the bash completions will be included in the
-  standard installers in future versions.)
-
---- DEPRECATION ----------------------------------------------------
-
-Effective this release:
-
-  - The `tex2page' and `combinator-parser' libraries have been moved
-    from the Racket distribution to PLaneT:
-
-     (require (planet plt/tex2page))
-     (require (planet plt/combinator-parser))
-
-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.
diff --git a/pkgs/plt-services/meta/announcements/v5.92.txt b/pkgs/plt-services/meta/announcements/v5.92.txt
deleted file mode 100644
index f4256ab64f..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.92.txt
+++ /dev/null
@@ -1,83 +0,0 @@
-1390668968
-Racket v5.92
-
-Racket 5.92 has a new package system, including a catalog of
-hundreds of already-available packages. Please visit
-
-  http://pkgs.racket-lang.org/
-
-for an overview of the packages.
-
-Recent releases included the "beta" versions of the package system.
-Racket version 5.92 incorporates many improvements suggested by these
-preliminary experiences:
-
- * A package is treated as a single collection by default, so it is
-   even easier to use a Github repository as a package. Get started
-   quickly:
-     http://docs.racket-lang.org/pkg/getting-started.html
-
- * DrRacket includes a new package manager GUI, available via the
-   File|Package Manager ... menu item. The GUI is also available
-   as a stand-alone program via the "gui-pkg-manager" package.
-
- * The main Racket distribution has been separated into about 200
-   packages. The Racket installer combines the core system with
-   bundled versions of these packages.
-
-   Alternatively, you may now install a Minimal Racket distribution
-   --- which is about 1/10 the size of the main distribution --- and
-   add only those packages that you need.
-
- * Package installation supports pre-built packages that include
-   compiled byte code and rendered documentation, meaning packages can
-   be installed quickly when built versions are available. All
-   packages in the main distribution are available in pre-built form.
-
-Further improvements are in the works, notably including package
-documentation on the package-catalog web site.
-
-COMPATIBILITY NOTE: PLaneT, the previous Racket package system, will
-remain in place for the foreseeable future, but we expect all package
-work to shift to the new system.
-
-Beyond the package system, this release brings a number of other
-changes:
-
- * Racket's HTML documentation has a new and improved look, thanks to
-   Matthew Butterick.
-
- * The documentation includes a style guide, "How to Program Racket"
-   http://docs.racket-lang.org/style/
-
- * Racket's JIT compiler supports the ARM architecture.
-
- * Racket supports the Mac's Retina display mode.
-
- * The performance of the Typed Racket compiler improved by 50% on
-   some typed programs; e.g., see http://bit.ly/1d0Ye4z
-
- * The profiler provides a new mode that uses the errortrace library
-   to produce fine-grained profiles.
-
- * A new contract profiler reports how much time programs spend
-   checking contracts, and which contracts are most expensive.
-
- * The math/flonum library exports fast 105-bit precision operations.
-
- * Check Syntax handles generated identifiers, especially those
-   introduced by struct (e.g. field selectors) and Redex (e.g., e_1,
-   e_2)
-
- * 2htdp/batch-io includes functions for dealing with html/xml in
-   files and web sites as X-expressions plus conveniences for
-   web-based graph traversals.
-
- * The `gen:set' generic interface extends set operations to work on
-   user-defined types that implement set methods, as well as on other
-   set-like built-in types, such as lists.
-
- * Picts support conversion to SVG format.
-
- * Under unix, Racket provides desktop entries (.desktop files) for
-   its graphical executables.
diff --git a/pkgs/plt-services/meta/announcements/v5.93.txt b/pkgs/plt-services/meta/announcements/v5.93.txt
deleted file mode 100644
index 9f8b631938..0000000000
--- a/pkgs/plt-services/meta/announcements/v5.93.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-1391210625
-Racket v5.93
-
-Version 5.93 repairs a few problems with the recent v5.92 release (in
-preparation for a v6.0 release):
-
- * fixed a low-level concurrency problem with the GUI library for Mac
-   OS X, which especially affected 32-bit builds;
-
- * fixed GRacket-based launchers (such as `drracket`) in a Unix-style
-   installation;
-
- * expanded the list of recognized OpenSSL library versions;
-
- * fixed small CSS problems and inconsistencies (relative to v5.3.6) in
-   the new Scribble style as used by the Racket documentation; and
-
- * added the version number back to the "racket" directory within the
-   source distribution bundle.
diff --git a/pkgs/plt-services/meta/announcements/v6.0.1.txt b/pkgs/plt-services/meta/announcements/v6.0.1.txt
deleted file mode 100644
index 897bc08d45..0000000000
--- a/pkgs/plt-services/meta/announcements/v6.0.1.txt
+++ /dev/null
@@ -1,62 +0,0 @@
-1399579520
-Racket v6.0.1
-
-* A new `racket/undefined` library exports `undefined` as the value
-  currently produced by
-
-    (letrec ([x x]) x)
-
-  This library anticipates a future where that expression will raise
-  an exception. The `racket/undefined` library will continue to offer
-  the `undefined` value as a bridge between versions and as a last
-  resort.
-
-* The drawing and GUI libraries provide improved support for
-  high-resolution bitmaps and their use on Retina displays. For
-  example, `read-bitmap` includes a `#:try-@2x?` option to trigger
-  substitutions through the usual "@2x" naming convention.
-
-* Check Syntax cooperates with Typed Racket to show arrows and other
-  Check Syntax highlighting even when there is a type error.
-
-* Functions provided via contract-out that have first-order contracts
-  perform better.
-
-* The contract boundary between typed/untyped modules is much less
-  expensive. Typed Racket now avoids generating contracts for places
-  where contracts failures cannot happen.
-
-* Occurrence typing now works better with when/unless. Example:
-
-    (let ((x (read)))
-      (unless (number? x) (error 'bad-input))
-      (add1 x))
-
-* Types in Typed Racket are now pretty-printed.
-
-* Function types can now be written in prefix style, which is now
-  preferred and is used for printing. Infix function types are still
-  accepted for backwards compatibility.
-
-* A new `->*' type constructor is used for writing types for functions
-  with optional and keyword arguments. The notation is similar to the
-  matching contract combinator.
-
-* Typed Racket forms do not have a `:' suffix by default now. For
-  example, the `struct' form replaces `struct:'. The suffixed versions
-  are all provided for backwards compatibility.
-
-* Typed Racket now has preliminary support for classes and
-  objects. However, it is still experimental and the APIs are subject
-  to change.
-
-* Type aliases in Typed Racket now support recursion and mutual
-  recursion. For example, `(define-type (MyList X) (U Null (Pair X
-  (MyList X))))' is now a valid type alias.
-
-* Plot correctly renders intersecting 3D graphs and non-grid-aligned
-  3D rectangles.
-
-* Elements in plots output in PDF/PS format have the same relative
-  scale as in other formats. In particular, it is not necessary to
-  adjust `plot-font-size` to make PDF plots look the same as PNG.
diff --git a/pkgs/plt-services/meta/announcements/v6.0.txt b/pkgs/plt-services/meta/announcements/v6.0.txt
deleted file mode 100644
index 099afdf2b8..0000000000
--- a/pkgs/plt-services/meta/announcements/v6.0.txt
+++ /dev/null
@@ -1,87 +0,0 @@
-1393453108
-Racket v6.0
-
-Racket 6.0 has a new package system, including a catalog of
-hundreds of already-available packages. Please visit
-
-   http://pkgs.racket-lang.org/
-
-for an overview of the packages.
-
-Racket versions 5.3.4 through 5.3.6 included "beta" versions of the
-package system. Racket version 6.0 incorporates many improvements
-suggested by preliminary experiences in those versions:
-
-  * A package is treated as a single collection by default, so it is
-    even easier to use a GitHub repository as a package. Get started
-    quickly:
-      http://docs.racket-lang.org/pkg/getting-started.html
-
-  * DrRacket includes a new package manager GUI, available via the
-    File|Package Manager ... menu item. The GUI is also available
-    as a stand-alone program via the "gui-pkg-manager" package.
-
-  * The main Racket distribution has been separated into about 200
-    packages. The Racket installer combines the core system with
-    bundled versions of these packages.
-
-    Alternatively, you may now install a Minimal Racket distribution
-    --- which is about 1/10 the size of the main distribution --- and
-    add only those packages that you need.
-
-  * Package installation supports pre-built packages that include
-    compiled byte code and rendered documentation, meaning packages can
-    be installed quickly when built versions are available. All
-    packages in the main distribution are available in pre-built form.
-
-The recent 5.92 and 5.93 releases served as release candidates for 6.0,
-and 6.0 includes a few additional repairs related to the package
-system.
-
-Further improvements to the package system are in the works, notably
-including package documentation on the package-catalog web site.
-
-COMPATIBILITY NOTE: PLaneT, the previous Racket package system, will
-remain in place for the foreseeable future, but we expect all package
-work to shift to the new system.
-
-Beyond the package system, this release brings a number of other
-changes:
-
-  * Racket's HTML documentation has a new and improved look, thanks to
-    Matthew Butterick.
-
-  * The documentation includes a style guide, "How to Program Racket"
-    http://docs.racket-lang.org/style/
-
-  * Racket's JIT compiler supports the ARM architecture.
-
-  * Racket supports the Mac's Retina display mode.
-
-  * The performance of the Typed Racket compiler improved by 50% on
-    some typed programs; e.g., see http://bit.ly/1d0Ye4z
-
-  * The profiler provides a new mode that uses the errortrace library
-    to produce fine-grained profiles.
-
-  * A new contract profiler reports how much time programs spend
-    checking contracts, and which contracts are most expensive.
-
-  * The math/flonum library exports fast 105-bit precision operations.
-
-  * Check Syntax handles generated identifiers, especially those
-    introduced by struct (e.g. field selectors) and Redex (e.g., e_1,
-    e_2)
-
-  * 2htdp/batch-io includes functions for dealing with html/xml in
-    files and web sites as X-expressions plus conveniences for
-    web-based graph traversals.
-
-  * The `gen:set' generic interface extends set operations to work on
-    user-defined types that implement set methods, as well as on other
-    set-like built-in types, such as lists.
-
-  * Picts support conversion to SVG format.
-
-  * Under unix, Racket provides desktop entries (.desktop files) for
-    its graphical executables.
diff --git a/pkgs/plt-services/meta/announcements/v6.1.1.txt b/pkgs/plt-services/meta/announcements/v6.1.1.txt
deleted file mode 100644
index 56772285c5..0000000000
--- a/pkgs/plt-services/meta/announcements/v6.1.1.txt
+++ /dev/null
@@ -1,60 +0,0 @@
-1415051299
-Racket v6.1.1
-
-* The MAC OS X YOSEMITE compatibility problems are fixed. We
-  bundled a patched Pango text-drawing library with Racket.
-
-* The WINDOWS [32-bit] releases fixes the window-update crashes.
-  We bundled a patched Cairo drawing library with Racket.
-
-* TYPED RACKET closes two safety holes in the exception system.
-  The revised type system restricts `raise' to send only
-  instances of the `exn' structure type and flat data to
-  handlers. It also checks exception handlers properly.
-  NOTE: Previously well-typed programs may fail to typecheck.
-
-* TYPED RACKET'S typed regions support casts and predicates.
-
-* 2HTDP/IMAGE'S notion of equality ignores an image's baseline.
-
-* The PACKAGE MANAGER supports a binary library installation mode,
-  which allows users to install packages without source or documentation. 
-  Use the `--binary-lib' option with `raco pkg install'.
-
-* The new DRRACKET-TOOL-LIB package factors out parts of DrRacket's
-  IDE so that they can be reused with other editors, such as Emacs.
-
-* The COMPILER'S use-before-defined analysis has been repaired for
-  certain forms of nested `letrec', some `let' forms, and some
-  uses of `set!' or `with-continuation-mark'.
-
-* The COMPILER performs additional bytecode optimizations.
-  Thanks to Gustavo Massaccesi.
-
-* The CML library comes with a new `replace-evt' event constructor.
-  Thanks to Jan Dvořák.
-
-* REDEX'S benchmark suite comes with a description of the benchmark
-  programs.
-
-* REDEX'S metafunctions can be typeset using the "large left brace"
-  notation for conditionals.
-
-* The CONTRACT library comes with an improved `contract-stronger?'.
-  Its error messages note that the contract itself might be wrong.
-
-* The GUI library is DPI-aware on Windows.
-
-* The OPENSSL library supports Server Name Indication for servers.
-  Thanks to Jay Kominek.
-
-* The SYNTAX/PARSE library allows the definition of new pattern
-  forms via pattern expanders, similar to match expanders.
-  Thanks to Alex Knauth.
-
-* OpenGL on Linux no longer depends on libgtkgl, and core profiles
-  are supported (see `set-legacy?').
-
-* The TEACHING LANGUAGES' unit test framework supports
-  `check-satisfied', a construct for checking whether a result
-  satisfies a predicate, e.g.: (check-satisfied (sort l) sorted?)
diff --git a/pkgs/plt-services/meta/announcements/v6.1.txt b/pkgs/plt-services/meta/announcements/v6.1.txt
deleted file mode 100644
index d2a82356cc..0000000000
--- a/pkgs/plt-services/meta/announcements/v6.1.txt
+++ /dev/null
@@ -1,65 +0,0 @@
-1407000198
-Racket 6.1
-
-The MAJOR INNOVATION concerns local recursive variable definitions.
-Instead of initializing variables with an `undefined' value, Racket
-raises an exception when such a variable is used before its definition.
-(Thanks to Claire Alvis for adapting Dybvig's "Fixing Letrec" work.)
-
-Since programs are rarely intended to produce #<undefined>, raising an
-exception provides early and improved feedback. Module-level variables
-have always triggered such an exception when used too early, and this
-change finally gives local bindings --- including class fields --- the
-same meaning.
-
-This change is backwards-incompatible with prior releases of Racket.
-Aside from exposing a few bugs, the change will mainly affect programs
-that include
-
-(define undefined (letrec ([x x]) x))
-
-to obtain the #<undefined> value. In its stead, Racket provides the same
-value via the `racket/undefined' library (which was introduced in the
-previous release). Programmers are encouraged to use it in place of the
-pattern above to obtain the "undefined" value.
-
-The release also includes the following SMALL CHANGES:
-
-* PLUMBERS generalize the flush-on-exit capability of primitive output
-  ports to enable arbitrary flushing actions and to give programmers
-  control over the timing of flushes (i.e., a composable `atexit').  New
-  functions include `current-plumber', `plumber-add-flush!', and
-  `plumber-flush-all'.
-
-* CONTRACTS: the contract system's random testing facility has been
-  strengthened so that it can easily find simple mistakes in contracted
-  data structure implementations (e.g. an accidental reverse of a
-  conditional in a heap invariant check).
-
-* REDEX: the semantics of mis-match patterns (variables followed by _!_)
-  inside ellipses has changed in a backwards-incompatible way. This
-  change simplifies the patterns' semantics and increases the usefulness
-  of these patterns.
-
-* TEACHING LANGUAGES: `check-random' is an addition to the preferred
-  unit testing framework in the teaching languages. It enables the
-  testing of students' functions that use random-number
-  generation. (Thanks to David Van Horn (UMaryland) for proposing this
-  idea.)
-
-* Upgraded and normalized versions of GRAPHICS LIBRARIES and
-  dependencies (Pango, Cairo, GLib, etc.) that are bundled with Racket
-  on Windows and Mac OS X. For example, FreeType support is consistently
-  enabled.
-
-* TYPED RACKET: its standard library includes contracted exports from
-  the Racket standard library, such as the formatting combinators of
-  `racket/format'. It also supports Racket's asynchronous channels; see
-  the `typed/racket/async-channel' library.
-
-* SSL: The openssl library supports forward secrecy via DHE and ECDHE
-  cipher suites (thanks to Edward Lee) and Server Name Indication
-  (thanks to Jay Kominek).
-
-* The `mzlib/class100' library has been REMOVED. Use `racket/class'
-  instead.