DrScheme Release Notes

Current Release: 50
Release Date: August 26, 1997.

Submit bugs using the web interface (encouraged) or send mail to plt-bugs@cs.rice.edu (discouraged).

The following is a summary of the major changes in this release from the previous one.

DrScheme

• DrScheme's fonts can now be configured through the Preferences dialog.
• DrScheme's Beginner and Intermediate languages are more strict. This provides better error messages for expressions like (1 2) or (cond (null? l)).
• A quasiquote bug has been fixed for forms like `(1 . ,3).
• The turn turtle command now turns counter-clockwise in degrees (instead of clockwise in radians). The The turn/radians command turns counter-clockwise in radians.
• Printing has been fixed.
• Output in the interactions window is much faster.

Donkey

• The Stepper tool (Donkey) is temporarily unavailable in release 50 and will reappear in a future release.

MrEd

• The look and speed of the non-Motif X Windows version has improved.
• See plt/mred/HISTORY and plt/mred/system/history in the distribution for other changes.

MzScheme

• Added compile-time inference of procedure names for better error reporting.
• Added a mechanism for saving and restoring heap dumps under Unix.
• See plt/mzscheme/HISTORY in the distribution for other changes.

Known Problems

• See plt/openbugs in the distribution.