Brian Harvey wrote:
>> I have never actually reached the end with understanding,
> 
> This scares me.  If you don't understand macros through and through,
> I never will -- which wouldn't matter, except that people keep saying that
> various non-macro things can't be understood without first understanding
> macros.  (Or maybe that's not what they're saying, and I'm even 
> misunderstanding the meta-discussion!)  To take the current example, I'm
> not ready to live in a world in which I don't understand the REPL.

There is a *great* tool for understanding macros that comes with PLT, 
called the macro stepper, developed by Ryan Culpepper.  If you can 
understand reduction, you can understand macros.

David

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