MzScheme 360

Note: This is MzScheme v360, which is what's packaged with Ubuntu Gutsy. I haven't had a chance to try PLT Scheme 4 yet, which by all accounts departs from the version 3 series considerably.

From the old PLT Scheme web page:

PLT Scheme is an umbrella name for a family of implementations of the Scheme programming language.
MzScheme is the lightweight, embeddable, scripting-friendly PLT Scheme implementation.

To reproduce my results on Ubuntu Gutsy Gibbon, install MzScheme with

sudo apt-get install mzscheme

and run the interpreter with

mzscheme --case-insens 2>&1

MzScheme makes the following choices: