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From: dewar@merv.cs.nyu.edu (Robert Dewar)
Subject: Re: How do functions return unbounded arrays?
Date: 1998/06/21
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Date: 1998-06-21T00:00:00+00:00
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Gavin said

<<They are in general forbidden in SPARK.
However, the "&" operator is allowed on string literals as you would expect a
compiler to handle this case statically.
>>

That is really an Ada 83 comment (SPARK is still somewhat Ada 83 oriented!)
In Ada 95, it is a requirement of the language that & on string literals
(actually more accurately on static string expressions -- a useful 
extension not permitted as far as I remember by SPARK) are required to
be handled statically.