[plt-dev] infix prefab literals

> As an aside, I believe you shouldn't have to write that define-struct
> to run those expressions.  Hence the word "prefab".  You only need the
> define-struct to use the functions make-:, :?, :-name, and :-binding.

Yeah, don't know why I threw that in there. Consider it executable 
documentation. :)

Dave

PS Eli, any idea why the subject line of my first message had "Re:" at 
the beginning? I created the message with the "new message" button in my 
mail client, not by replying to a previous message.