[Fwd: Scheme 48 1.2 available]

-------- Original Message --------
Subject: Scheme 48 1.2 available
Date: Tue, 14 Dec 2004 15:05:20 +0100
From: Michael Sperber <sperber-jNDFPZUTrfQQDnmTUQnR1uqEdJ8o/[email protected]>
Newsgroups: comp.lang.scheme


Scheme 48 is an implementation of Scheme written by Richard Kelsey and
Jonathan Rees. It is based on a byte-code interpreter and is designed
to be used as a testbed for experiments in implementation techniques
and as an expository tool. It comes with a module system, an
extensive set of libraries, an interactive command-line-based
development environment and a manual in various formats. Scheme 48
runs on most Unix/Linux systems, and is fully R5RS-conformant.

Scheme 48 is available (under a very liberal license) from

http://www.s48.org/

Scheme 48 1.2 is primarily a maintenance release, with many bug fixes
and a modest number of feature additions---among them SRFI 22
("Running Scheme Scripts on Unix") and floating-point support by
default.  We thank the many users who reported bugs and suggested
improvements for previous releases.

Enjoy!
The Scheme 48 maintainers

---
Release Notes:

12/05/04 (version 1.2)

          Additions:
           The LU-DECOMPOSITIONS structure was added for good.
           The CONDVAR structure now exports CONDVAR?.
           SRFI 22 ("Running Scheme Scripts on Unix") is fully
            supported.
	  An implementation of SRFI 45 was added.
           Scheme 48 now builds from a directory other than the source
            directory.  This enables builds for multiple platforms
            from a single source directory.

          Changes:
           Scheme 48 uses floating-point arithmetic by default
            now---as if FLOATNUMS were loaded in a previous release.  To
            that end, Scheme 48 now uses Bob Burger's lightning-fast
            free-format floating-point printer.
           "make install" now creates the installation directories.

          Bug fixes:
           The PreScheme compiler works again for the VM---in
            1.1, there was a bug in the type inferencer related to
            exactness.
           A number of bugs in the REGEXPS structure were fixed
            (many noted by James B Crigler).
           The closed compilator for ERROR was buggy
            (reported by Taylor Campbell).
           A number of documentation bugs were fixed.
           The assembler works again, at least rudimentarily.
           The SPATIAL structure loads and works again.
           Most of the code in scheme/misc (ANNOTATIONS, DOODL, SICP,
            INTEGER-LENGTHS) works again.
	  SPAWN now returns the created thread, and the THREADS
	   structure exports CURRENT-THREAD.  (As the 1.1 documentation
	   already claimed.)
           Floating-point numbers are now printed correctly.  (See
            above.)
           "make install" now installs scheme48write-barrier.h.
           Two subtle GC bugs related to threads were fixed
            (reported by Jorgen Schaefer).
	  Some arithmetic bugs were fixed (reported by Aubrey Jaffer).
           A number of bugs related to the handling of I/O error were
            fixed.
	  The debugger now prints more information about the context
	   of a VM exception.
           A GC bug related to POSIX signals was fixed.
           The POSIX-PROCESSES structure now exports SIGNAL? and SIGNAL=?.