From: Matthew Flatt <mflatt@cs.utah.edu>
To: plt-scheme@fast.cs.utah.edu
Date: Tue, 6 Mar 2001 17:38:39 -0800
Subject: 199.2

The v200-tagged code in CVS for MzScheme and MrEd is now version 199.2.

Changes:

 * `syntax->datum’ renamed to `syntax-object->datum’ (for compatibility
   with Chez).

 * `datum->syntax’ renamed to `datum->syntax-object’, and arguments
   reordered (for compatibility):

      (datum->syntax-object cxtx-stx datum [src-stx])

 * The `struct’ form is gone, replaced by the `make-struct-type’
   procedure.

   The `define-struct’ form works as before, but also supports an
   optional inspector expression after the field list.

 * Added a `make-struct-type’ procedure, struct type properties, and
   inspectors.

   Properties let a programmer attach static information to a
   structure type. Using properties, structure-based classes can be
   implemented more efficiently.

   Inspectors provide debugging access, with a custodian-like hierarchy
   for opacity. The form

    (define-struct s (f ...))

   creates a type for structs that are effectively opaque. Use

    (define-struct s (f ...) (make-inspector))

   for transparent structs.

 * Fixed a bug in immediate modules that use module paths.

 * Started migrating docs to SLaTeX and tex2page formatting of code.

Temporary docs are at

 http://www.cs.utah.edu/~mflatt/tmp/mzscheme.pdf
 http://www.cs.utah.edu/~mflatt/tmp/mzlib.pdf

Next stop: revised class system.

Matthew