• Nov 14 - Clarified that iter returns nil.
• Nov 11 - Clarified that while evaluates to nil.
• Nov 6 - Clarified that implementatino should call to_s on the value returned by the top-level expression and then the resulting string should be printed (by returning it from main).
• Nov 4 - Added missing case to print EInstanceOf to output_expr

The project is described in p5.pdf.

The code skeleton is in p5.tar.gz.