| From: Vincent Manis <vmanis@telus.net>
 | Date: Mon, 23 Jan 2012 17:01:54 -0800
 |
 | On 2012-01-23, at 15:04, John Cowan wrote:
 | > In order to allocate a string as an immediate, you also have to
 | > prove that it's immutable.
 |
 | In the absence of a procedure for mutating the length of a string,
 | empty strings are immutable.
 |
 | I guess I'd like to see a use case where it really paid off to define
 | (eq? (string) (string)).  In the absence of one, I personally don't
 | care if the result is unspecified.

If there is only one empty string, then it would be convenient to be
able to match that empty string in a case statement:

  (case obj (("") ...))

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