[Fwd: PLT Scheme v299.200]

-------- Original Message --------
Subject: [PLT announcement] PLT Scheme v299.200
Date: Tue, 9 Aug 2005 02:20:47 -0400
From: Eli Barzilay <[email protected]>
To: [email protected], [email protected]

PLT Scheme v299.200 is now available from

     http://download.plt-scheme.org/

THIS IS A v300 ALPHA RELEASE.  Teachers and students using DrScheme
with "How to Design Programs" should wait for the final v300 release,
which will occur close to a new semester.

* DrScheme's new "Debug" button provides limited debugging support.
   The programmer can pause a program in the definitions window,
   inspect local variables, set pause points, step past expressions,
   and change evaluation results.

   DrScheme's debugging support builds on MzTake, the scripted
   debugger, which is now included in the distribution.

* MzScheme supports reader extensions through #reader, and it provides
   readtables to customize the built-in reader. Structure printing can
   be customized through a `prop:writable' property.

* HtDCH USERS: the draw.ss teachpack has an entirely new interface.
   Canvas is now the class for drawing pictures, World is for animated
   worlds.  See doc.txt and the revised version of HtDCH.

* New "Java+dynamic" ProfessorJ language improves interoperability
   between Scheme and Java; details to appear at OOPSLA'05.

* FrTime has been refined significantly, with several important bug
   fixes and performance enhancements.

The v300 series (including v299.200) is incompatible with the v200
series.  The most significant incompatibilities include (1) support
for Unicode breaks old programs that treat characters as bytes or
pathnames as strings; (2) case-sensitivity is now the default; and (3)
the built-in exception hierarchy has been revised.

Fdeeback Wlecome
-- 
           ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                   http://www.barzilay.org/                 Maze is Life!

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