[plt-scheme] PLT Scheme v4.1.4

From: Eli Barzilay (eli at barzilay.org)
Date: Wed Jan 21 02:09:17 EST 2009

PLT Scheme version 4.1.4 is now available from


* New libraries include `scheme/package' (for nestable static
  modules) and `ffi/objc' (support for Objective-C).

* New teaching support includes a "universe.ss" teachpack for
  connecting "worlds" over a network.

* Redex now supports automatic test-case generation.  Specify a
  predicate that should hold of your reduction system, and Redex
  will attempt to falsify it.  See 'redex-check' in the manual for
  more details.

* Improvements to the run-time system include better and more
  reliable memory-limit tracking, function contracts that preserve
  tail recursion in many cases, native debugging backtraces on
  x86_64, and performance improvements.

* Improved libraries include enhancements to `scheme/sandbox',
  better handling of zero-sized matches by `regexp-split' and
  friends, an `equal<%>' interface for specifying equality on
  class instances (and more general support for attaching
  properties to interfaces), equality (via `equal<%>') for image
  objects, and refinements to `scheme/foreign' to support atomic
  operations and function-pointer conversions.

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

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

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