posted by Eli Barzilay
PLT Scheme version 4.0.1 is now available from
This release fixes a number of bugs. Most noteworthy, the “Internal Error” message when requiring a PLaneT package has been fixed and user-defined teachpacks now work properly.
If you are a user of the world.ss, its interface has changed:
— end-of-time has been removed
++ (stop-when last-world?) has been added
— matthias, 23 June 2008