[racket] Typed Racket frustration

From: Pierpaolo Bernardi (olopierpa at gmail.com)
Date: Sat Jan 24 02:33:02 EST 2015

On Sat, Jan 24, 2015 at 7:43 AM, Matthew Butterick <mb at mbtype.com> wrote:

> PS. I remain curious what one can do with an immutable `hash` function that
> takes no arguments, but perhaps it is meant to be a TR koan.

It has about the same uses as an immutable empty list. You start with
an empty table then add things to it to obtain non-empty tables.  It
is a very common occurrence in my code, and I'm sure I'm not alone in
this.

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