A couple idle notes from this morning before I refactor the file
structure.
Checkpoint.
Refactored presentation into separate racket modules.
revised title slide
Revised first section.  That took longer than it should have.
A rust-oriented syntax highlight hack.
Use rust syntax highlighting.
Use rust syntax highlighting.
some other example code I started playing with to prep concurrency section.
Alpha-renamed IntPair to Pair and switched to using {:?} for println! of it.
Trimmed down macro slide to fit in fail! and make less chatty.

Fixed bug in Ownership slide.
More play code.
Fixed some bugs.  Added a secton on dynamic dispatch.
Put back an old example as main to double-check its output.
Fixed bugs in section 3.
Revised concurrency slides to use PLT to draw the pictures.
Removed items that I covered or do not want to mention.
last minute deltas before going up