From: Eli Barzilay <firstname.lastname@example.org> To: email@example.com Subject: [PLT announcement] PLT Scheme v4.2.5 Date: Fri, 02 Apr 2010 21:35:51 -0400 PLT Scheme version 4.2.5 is now available from http://plt-scheme.org/ * PLT now supports multi-core parallelism via futures. Futures create tasks that run in parallel, as long as the tasks stay in the "fast path" of the runtime system. For more information, see http://tinyurl.com/futuresguide . * Our unit testing framework, schemeunit, is now included in the distribution. A graphical test runner is available via schemeunit/gui. * The support languages for the "Programming Languages: Application and Interpretation" textbook by Shriram Krishnamurthi are now part of PLT Scheme. In addition the PLAI GC language comes with a random mutator generator (to help test collectors) and an improved heap visualizer. * New Russian and Ukranian translations, thanks to Sergey Semerikov. * A number of improvements to Redex’s typesetting facilities. * Typed Scheme users can now automatically generate predicates from types with `define-predicate’. Typed code can be inserted in untyped modules by requiring `with-type’ from `typed/scheme’. * The `scheme/class’ library now provides contract combinators for classes (`class/c’) and objects (`object/c’). See the Reference and Guide for details. Also, a backwards-compatible `object-contract’ version of `object/c’ has replaced the old `object-contract’ combinator. * Writing new kinds of contracts is now easier with keyword-based constructors (`make-contract’ and `make-flat-contract’), a simpler set of structure properties (`prop:contract’ and `prop:flat-contract’), and the introduction of blame objects for tracking contract metadata. * The Scheme-implemented bytecode reader fails less often. This is used by "mzc --decompile". The Scheme-implemented bytecode writer uses the compact bytecode format and fails less often. This may be used in the future for Scheme-implement bytecode processors. * The language dialog now suggests using "#lang" more strongly as the default language. DrScheme no longer uses the term `Module language’. [Note that mirror sites can take a while to catch up with the new downloads.] Feedback Welcome, -- ((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay: http://barzilay.org/ Maze is Life!